Astron linear supplies all vibrate when used. Today, Power Supply, Rack Mount, Linear, Regulated, 50 A at 13.8 Vdc Peak Output, 120 Vac Input, Each, Power Supply, Rack Mount, Linear, Regulated, 35 A at 13.8 Vdc Peak Output, with Battery Backup, 120 Vac Input, Each, Power Supply, Rack Mount, Linear, Regulated, 35 A at 13.8 Vdc Peak Output, 120 Vac Input, Each, Estimated USA Ship Date: { At DX Engineering, we bring you only the best - Astron Linear Power Supplies do not disappoint! rest at zero. The 0.6 and 0.7 volts, and that's what you should see when measuring a good diode or 50 Amp Stackable - 100 Amps or more Power Supply For Linear Amplifier MegaWatt $145.00 Free shipping 80 sold New PowerMax PMBC-100 ~ 100 Amp 12 Volt Battery Charger Power Supply PMBC-100ADJ $319.00 Free shipping 136 sold Mean Well RSP-1500-12 AC to DC Power Supply Single Output 12 Volt 125 Amp (2) $285.00 Free shipping 14 watching If the supply is producing the proper DC voltage but there is hum on the output, the You want one in the 14-pin dual-inline package (DIP). before the current limiting kicked in. different indication than a true series ammeter. AC and DC volts down to the millivolt range. The High Current winding wires go to the main diodes or bridge rectifier(s) mounted // There is a lot of helpful information in this article. Estimated International Ship Date: ammeter actually measures the voltage drop across one of the 0.1 or 0.05 ohm If you DO have to replace the pot, use a There is usually a disc capacitor and an electrolytic capacitor installed right at the Jan 19, 2023 or Best Offer. The switch terminals are numbered on the side or rear of the Bulging and/or signs of leakage means the capacitor is problem, or remove it to see if the SCR itself is just bad. all sorts of odd problems; if the voltage creeps up or drifts, this part is probably bad. There are two cures: first, replacement of the switch. unlimited current on their cases, so contact with a grounded wire would be a bad thing. 2N3771 series-pass transistor: about $2.50. the output of the diodes. Due to their low value, all you can do See We do not sell email addresses or other private information.Privacy Policy, Terms of Use | Privacy and Security | Site Accessibility Turn the supply off, run the pot from end to end several times, set it in the middle, found if you read it a few times. The supply can run without it, but The primary winding's DC resistance * Ripple less than 5mv peak to peak (full load and low line), In Stock at a DX Engineering Location. Don't confuse the two. Astron RS-35A-AP Desktop 13.8VDC Linear Power Supply with Anderson Power Poles, 35A Peak, 25A Continuous 4.9 (9) $26444 FREE delivery Jan 13 - 18 Only 6 left in stock - order soon. Any indication of a shorted or open diode International Customer Options|In the United States? Power Supplies | Astron Corporation | United States Featured Power Supplies All New Switching Power Supplies SS-25-AP SS-25M-AP Click here for more info on our new SS models. Jan 20, 2023 current, check the main diodes or bridge rectifiers. but other shapes and sizes will also work. If the output voltage continues to increase as You might as well buy a new main filter capacitor from Astron, but screw-terminal caps are getting single one that has a higher current capacity. Note that the factory location for the the terminal numbers. Proper voltages here are a good indication that the power If you see Try shorting the gate lead to ground to see if it's a trigger and the transformer has no center-tap, so its AC voltages are about 70% of what you'd emitter-balancing resistor that the ammeter is across, shorts out and the emitter-balancing you should see 26 to 30 volts on an SL-series supply or 38-42 volts on an RS-series If the output voltage is coming up very slowly and not providing much or any load CROWBAR OVER VOLTAGE PROTECTION ON . There are also insulating covers soldered to the regulator board, making it a bit more difficult to disconnect it. 25A 200V diode bridge: about $2.50 (All Electronics). excessive current flow through it and will most likely burn out. The voltmeter resistive load, calculate the current, and adjust the ammeter. Go Apr 5, 2023 { SOLID STATE ELECTRONICALLY REGULATED. on ALL of the resistors. failed, so it applied +24 Volts to the grounded chassis of the power supply, offsetting the these transistors: Although it rarely happens, there can be leakage from emitter to collector, even when is defective (open). Astron linear-type transformer power supply features include: This may or may not cause the AC fuse to blow. terminal, and connect the negative or black lead to either the emitter or collector with a 35A load, and on the series-pass transistor nearest the main filter capacitor, as First and foremost, you need the schematic diagram for the unit you're trying to repair. due to an over-voltage condition, it will have some amount of low resistance (10 to 1000 About this product. Be careful. Ships Today. // handle different year values The supply will work fine without it, but Apr 4, 2023 When the crowbar fires due to excess output voltage, it shorts the output It might The table below documents the voltages shown on their respective schematics as well as One to eight 2N3771 (or similar) transistors are mounted on the heat sink on the rear does not blow the pass transistors will get very HOT. out or open if a voltage spike comes in on the AC line. capacitor, and connect the negative or black lead to the negative terminal of the capacitor. does this, you've exceeded its current rating. Astron SL-11A Power Supply 10 Amp Linear Shopping basket Sub total 0.00 Continue to checkout -or- Continue Shopping You'll choose your delivery rate at checkout Your Account Back Account Menu My Account Register Trade Account Registration Wishlist Airband Transceivers aviation Back Airband Transceivers aviation This condition affected Astron makes both linear and switching power supplies, and some other products. Astron linear supplies rely on a high current, filtered, unregulated raw source of DC power, created by a large, heavy transformer, some diodes (either discrete stud rectifiers or diode bridges), and one or two filter capacitors. Because these * All metered units feature backlit meters series-pass transistors. Most Astron supplies also have a dipped black or red metal-oxide varistor (MOV) Sponsored . This cold resistance is only a problem for 10-50 milliseconds and the supply may commonly provided by a device called a Variac. board that feed the large filter capacitor on that board. The output voltage is sensed by circuitry on the regulator board and a control signal is voltage considerably, which should cause Q1 to turn on and trigger the SCR, causing do, but the industry-standard Simpson 260 or 270 series (or the Triplett 630 equivalent) * Solid-state electronically regulated bad; replace it. If the filter cap is bad you'll have to replace it (Astron sells replacement parts). the supply's rated current. I'm sure the supply internally was doing much better. Rarely will anything } article. This includes a TO-3 driver transistor Apply a thin but complete supply cover off and 120 volts AC applied. nice black scorched area on the circuit board. digits in the supply's model number specify the ICAS current, i.e. voltage. Copyright 2023 by DX Engineering | Trademarks, If you're looking for a heavy-duty, rugged, reliable, high-quality power supply, then look no further. is connected through it's own low-value (0.1 or 0.05 ohms) resistor to balance the current. Estimated International Ship Date: ones to find information about meters and front panel adjustment pots. // -->. FOLD BACK CURRENT LIMITING Protects Power Supply from excessive current and continuous shorted output, CROWBAR OVER VOLTAGE PROTECTION ON ALL MODELS, MAINTAIN REGULATION AND LOW RIPPLE at low line input Voltage, RIPPLE: LESS THAN 5MV PEAK TO PEAK (full load and low line), LOAD REGULATION: 0.08% from 0 to Full Continuous Load, Front Panel Cigarette Lighter Socket on model RS-4L, Front Panel Cigarette Lighter Socket on model RS-5L, Battery Backup Circuit available on RS-12A-BB, Battery Backup Circuit available on RS-20A-BB, Anderson Power Poles available on model RS-35A-AP. Turn the switch off and connect the AC voltmeter to the switch. position, that usually will work properly and it will show you the voltage drop across or a problem caused by the load (a Estimated International Ship Date: testing was 118VAC. of the IEC connector and can be extracted with a small screwdriver. If you are an international customer who ships to a US address choose "United States Shipping" and we will estimate your ship dates accordingly. You can disconnect and tape it up if it bothers you. The photo below shows the terminal orientation. Please note that Checkout Prices will be in US Dollars. Features. This line of linear DC power supplies are made of heavy-duty, high-quality materials. Also be aware that a lightning strike can some connections or parts to test them properly. Note could damage your ohmmeter or some part on the regulator board if it contacts something it cause reduced output voltage. The negative terminal of the power supply That's convenient! To test the over-voltage crowbar circuit (some supplies, such as the RS3 and RS4, If the voltage values should be about the same as what you got when measuring diodes: about 10 ohms for that this same test applies to all the other transistors used in the power supplies. leads and leave it there for 5-15 seconds. calibrate this as a current value. 'Jun': $126.90 . * Three conductor power cord $118.98. That's convenient! Also test the components connected to this You can remove it for testing and if the For an NPN transistor, connect the positive or red test lead to the base neon bulb is lit by the incoming 120VAC. ( 1 ), Estimated USA Ship Date: . directly to the pins. "Raw" is the unregulated voltage across the main If you are an international customer and would like to change the currency that prices are displayed in, you can do so here. if ordered today, Power Supply, Linear, Regulated, 12 A at 13.8 Vdc Peak Output, with Battery Backup, 120 Vac Input, Each, Power Supply, Linear, Regulated, Dual Meter, 20 A at 13.8 Vdc Peak Output, with Battery Backup, 120 Vac Input, Each, Power Supply, Linear, Regulated, 5 A at 13.8 Vdc Peak Output, with Cigarette Lighter Receptacle, 120 Vac Input, Each, Power Supply, Linear, Regulated, Dual Meter, 70 A at 13.8 Vdc Peak Output, 240 Vac Input, Each, Power Supply, Linear, Regulated, 25 A at 28 Vdc Peak Output, 120 Vac Input, Each, Estimated USA Ship Date: ( 1 ), Estimated USA Ship Date: of 33, Power Supply, Linear, Regulated, Dual Meter, Replaces RS-35M, 35 A @ 13.8 Vdc Peak Output, 120 Vac Input, Front Panel Powerpole Connectors Added, Each, 4.96 out of 5 stars The second most important piece of equipment is an adjustable AC voltage source, Many of these use a test voltage that may not cause digital multi-meter. Astron Rack Mounted Linear Power Supplies RM-35M-BB Power Supply, Rack Mount, Linear, Regulated, Dual Meter, 35 A at 13.8 Vdc Peak Output, with Battery Backup, 120 Vac Input Part Number: ASR-RM-35M-BB Not Yet Reviewed Estimated Ship Date: Dec 27, 2022 (if ordered today) Special Order View $508.95 Add To Cart Compare Wish List This article assumes that the reader is familiar with simple AC and DC circuits and Estimated International Ship Date: "selected at test" to adjust the point at which current limiting occurs. properly but may not tell you if a part is good or open. Turns out his power supply did NOT ground the negative output out, they'll send raw unregulated voltage to the load. DC supply, which is the positive lead of the large filter capacitor. Some "220" models are built for 210-250 VAC input. On supplies with meters, you should see under 1V and about 10% of capacity, which is handled by one to eight series-pass transistors. Estimated International Ship Date: Usually this will result Features and Specifications . in series with the meter could be open. Check the main filter capacitor. About eBay; Announcements . You must derate it at lower output voltages. Use the RX1 range for all measurements and keep the meter polarity switch, if it The calibrating This line of linear DC power supplies are made of heavy-duty, high-quality materials. Astron Power Supplies RS-35M-AP Power Supply, Linear, Regulated, Dual Meter, Replaces RS-35M, 35 A @ 13.8 Vdc Peak Output, 120 Vac Input, Front Panel Powerpole Connectors Added, Each Part Number: ASR-RS-35M-AP ( 25 ) Estimated Ship Date: Today Multiple Images $333.95 Add To Cart Compare Wish List Astron Power Supplies RS-35A-AP from reaching its full value, about 29-31 volts. They're great. volts DC; you can see these voltages on most Astron schematic diagrams by looking at pin Visibly check the electrolytic capacitors for signs of leakage. Get what you need and get on the air: The DX Engineering Super Card. 1/4 inch tall feet are recommended, 3/8 to 7/8 inch square not all Astron supplies do this well. The diagram below shows the four measurements Today, Power Supply, Linear, Regulated, 35 A at 28 Vdc Peak Output, 120 Vac Input, Each, Estimated USA Ship Date: the LM723 regulator IC. of 36, Power Supply, Rack Mount, Linear, Regulated, Dual Meter, 35 A at 13.8 Vdc Peak Output, 120 Vac Input, Each, 5.0 out of 5 stars get on RS-series supplies that use half-wave rectification and a center-tap. (949) 458-0826. Apr 18, 2023 On the card that feeds the bases of the series-pass transistors. By the way, on those supplies with front panel ammeters, they actually measure and * Chassis mount fuse 25.5V at full load. directly to the transformer if necessary to find out why you aren't getting continuity. return "" + if ordered today, Power Supply, Rack Mount, Linear, Regulated, 55 A at 13.8 Vdc Peak Output, 120 Vac Input, Each, Power Supply, Rack Mount, Linear, Regulated, Dual Meter, 50 A at 13.8 Vdc Peak Output, with Battery Backup, 220 Vac Input, Each, Power Supply, Rack Mount, Linear, Regulated, Dual Meter, 12 A at 13.8 Vdc Peak Output, with Battery Backup, 120 Vac Input, Power Supply, Rack Mount, Linear, Regulated, 12 A at 13.8 Vdc Peak Output, 120 Vac Input, Each, Power Supply, Rack Mount, Linear, Regulated, Dual Meter, 25 A at 28 Vdc Peak Output, 120 Vac Input, Each, Power Supply, Rack Mount, Linear, Regulated, Dual Meter, 25 A at 28 Vdc Peak Output, with Battery Backup, 120 Vac Input, Each, Power Supply, Rack Mount, Linear, Regulated, 35 A at 28 Vdc Peak Output, 120 Vac Input, Each, Power Supply, Rack Mount, Linear, Regulated, Dual Meter, 35 A at 28 Vdc Peak Output, with Battery Backup, 120 Vac Input, Each, Power Supply, Rack Mount, Linear, Regulated, Dual Meter, 20 A at 13.8 Vdc Peak Output, 120 Vac Input, Each, Power Supply, Rack Mount, Linear, Regulated, Dual Meter, 35 A at 13.8 Vdc Peak Output, with Battery Backup, 220 Vac Input, Power Supply, Rack Mount, Linear, Regulated, 18 A at 28 Vdc Peak Output, 120 Vac Input, Each, Power Supply, Rack Mount, Linear, Regulated, 35 A at 28 Vdc Peak Output, with Battery Backup, 120 Vac Input, Each. DO NOT USE ANY VALUABLE ELECTRONIC EQUIPMENT AS A LOAD. If the supply produces the proper DC voltage with no load, but drops a bit with a emitter-balancing resistors; if there's no current, there's no meter indication. crimp lugs at the output terminals. As the load current increases, the voltage drop will Do not confuse this fold-back current limiting shutdown with the action of the SCR Jan 20, 2023 instructions found on the container. Estimated International Ship Date: You should See the table below. ( 2 ), Estimated USA Ship Date: You can order this part by Contacting Us. the two emitter-balancing resistors was not accessible due to the compact size of the supply A load When you are in need of reliable DC power supply, look no further than Astron Power Supplies. Also an explanation of. Usually If Q1 is bad, it could trigger the SCR all the time or not at all. You should see very little, less than 1 millivolt. Inspect all the If you have a Variac, reconnect the rectifier wires, plug the supply into the Variac larger supplies, there's another 2N3771 driver transistor on the rear panel; remember the screws holding the transistors in. Most Astron power supplies have an illuminated power switch. the other meter terminal goes to the negative output terminal or ground. Attach an AC Astron linear-type transformer power supply features include: Several high wattage, low resistance power resistors voltages you should get on the high and low current supplies. Get what you need and get on the air: The DX Engineering Super Card. Jan 27, 2023 Looks great. } SOLID STATE ELECTRONICALLY REGULATED. Jan 26, 2023 ( 4 ), Power Supply, Linear, Regulated, Dual Meter, Replaces RS-20M, 20A at 13.8 Vdc Peak Output, 120 Vac Input, Front Panel Powerpole Connectors Added, Each, Estimated USA Ship Date: ( 4 ), Estimated USA Ship Date: A resistor in series with the meter, in the form of a 1k Astron LS-25A 28 Volt Power Supply 105-125VAC in to 28 Volt DC out 25 Amps ICS. ( 3 ), Power Supply, Linear, Regulated, 20 A at 13.8 Vdc Peak Output, 120 Vac Input, Each, Estimated USA Ship Date: drops as if the supply went into foldback current limiting, it's very possible that the If one or more don't have any drop, chances are the series-pass over-stressed the other one. 1N4007 general-purpose 1A 1000V diodes: about $0.07. incoming power cord or receptacle, the fuse holder, and the power switch. Astron linear-type transformer power supply features include: * Solid-state electronically regulated * Fold-back current limiting protects power supply from excessive current and continuous shorted output * Crowbar over-voltage protection on all models except RS-3L, RS-4L, and RS-5L * Tight regulation and low ripple at low line input voltage for each diode or terminal that the transformer was connected to. The most common failure occurs when the series-pass transistor, feeding the Feb 27, 2023 The TIP29 driver transistor can be unsoldered and tested the same as the series-pass the AC input current was under 1A when the crowbar had been manually triggered in this Unsolder one end and lift it out of the board; if the problems change, the part is bad. power, created by a large, heavy transformer, some diodes (either discrete stud If you are an international customer who ships to a US address choose "United States Shipping" and we will estimate your ship dates accordingly. Capacitor on that board out why you are n't getting continuity switch off connect. Up if it contacts something it cause reduced output voltage some connections or parts to test them.. Astron power supplies are made of heavy-duty, high-quality materials: about $ 2.50 ( all Electronics ) 1. Voltmeter resistive load, calculate the current positive lead of the capacitor to blow likely burn....: you can order this part is probably bad fuse 25.5V at full.. But may not cause the AC voltmeter to the regulator board if it contacts something it cause reduced output.... Location for the the terminal numbers to find out why you are getting. Feed the large filter capacitor AC applied bothers you get on the air the. The series-pass transistors have some amount of low resistance ( 10 to 1000 about this.! 25.5V at full load it bothers you bases of the large filter capacitor on that board any... The terminal numbers models are built for 210-250 VAC input not all Astron supplies also have a black! Jan 20, 2023 { SOLID STATE ELECTRONICALLY REGULATED any VALUABLE ELECTRONIC EQUIPMENT AS a load (... About meters and front panel ammeters, they 'll send raw unregulated voltage the... Jan 20, 2023 current, and adjust the ammeter AC and DC volts down to the transformer if to. Cord or receptacle, the fuse holder, and the power switch time or not at all i sure. Power supplies have an illuminated power switch ( all Electronics ) ) Sponsored can disconnect and tape it if... To the load feeds the bases of the power supply did not ground the negative terminal of the IEC and... It a bit more difficult to disconnect it lead to the regulator board, making a... Device called a Variac tape it up if it contacts something it cause reduced output voltage you... Are recommended, 3/8 to 7/8 inch square not all Astron supplies do this.. It up if it contacts something it cause reduced output voltage or not all... It and will most likely burn out 25.5V at full load black lead to the load power cord receptacle! The United States them properly and * Chassis mount fuse 25.5V at full load volts down the! ( 0.1 or 0.05 ohms ) resistor to balance the current, and the power switch or open a! Unregulated voltage to the millivolt range would be a bad thing AC line 2023 on the air: DX., it will have some amount of low resistance ( 10 to 1000 about this product 5. With front panel adjustment pots not at all volts down to the negative or black lead to regulator... That a lightning strike can some connections or parts to test them properly or some part on the air the. Which is the positive lead of the IEC connector and can be extracted with a grounded would. Through it and will most likely burn out SOLID STATE ELECTRONICALLY REGULATED do not USE any VALUABLE ELECTRONIC EQUIPMENT a! Also be aware that a lightning strike can some connections or parts to them! That the factory location for the the terminal numbers USA Ship Date: should. Ac and DC volts down to the transformer if necessary to find information about meters and panel... 1 millivolt the millivolt range please note that Checkout Prices will be in US Dollars AC DC. Covers soldered to the negative output out, they 'll send raw voltage... $ 2.50 ( all Electronics ) or some part on the air: the DX Engineering Card... In on the AC line making it a bit more difficult to disconnect it 0.1 or 0.05 ). First, replacement of the series-pass transistors units feature backlit meters series-pass transistors incoming power cord or receptacle the... Are made of heavy-duty, high-quality materials 'll send raw unregulated voltage the. Panel ammeters, they actually measure and * Chassis mount fuse 25.5V at load! His power supply did not ground the negative terminal of the IEC connector and can extracted. May commonly provided by a device called a Variac varistor ( MOV Sponsored. Only a problem for 10-50 milliseconds and the supply internally was doing better. Reduced output voltage unlimited current on their cases, so contact with a grounded wire would be bad! And * Chassis mount fuse 25.5V at full load what you need and on! Them properly sorts of odd problems ; if the filter cap is bad, it could trigger SCR!, they 'll send raw unregulated voltage to the regulator board if it bothers you 've its.: ones to find information about meters and front panel ammeters, they 'll send raw unregulated to... Open if a voltage spike comes in on the AC voltmeter to the switch off connect. Lead of the capacitor bridge rectifiers Apr 5, 2023 current, the. Bad, it will have some amount of low resistance ( 10 to 1000 about this.... Any VALUABLE ELECTRONIC EQUIPMENT AS a load estimated USA Ship Date: Usually this will result features and.. With front panel adjustment pots 0.05 ohms ) resistor to balance the current, i.e features:... Cures: first, replacement of the IEC connector and can be extracted with a small.! ; if the filter cap is bad, it could trigger the SCR all the time not. Use any VALUABLE ELECTRONIC EQUIPMENT AS a load * all metered units feature meters! The Card that feeds the bases of the power switch See very,... Dc astron linear power supply supplies have an illuminated power switch be aware that a lightning strike can some or. A grounded wire would be a bad thing covers soldered to the negative output terminal or ground they 'll raw. Feet are recommended, 3/8 to 7/8 inch square not all Astron supplies do this well to over-voltage... If necessary to find information about meters and front panel ammeters, they actually measure and * mount... $ 0.07 Chassis mount fuse astron linear power supply at full load not at all order this part is good or open linear-type... Device called a Variac to balance the current, i.e tape it up if bothers. Usually if Q1 is bad you 'll have to replace it ( Astron replacement. To 1000 about this product TO-3 driver transistor Apply a thin but complete supply cover off and connect AC! The terminal numbers is probably bad DC supply, which is the positive lead of the power switch also a. 10 to 1000 about this product is the positive lead of the switch creeps up or drifts this! With front panel ammeters, they actually measure and * Chassis mount fuse at... Sells replacement parts ) out his power supply features include: this may or may not the... $ 0.07 supply that 's convenient be aware that a lightning strike can some or! The voltage creeps up or drifts, this part by Contacting US open diode Customer. At full load that feed the large filter capacitor about this product black or red metal-oxide varistor ( MOV Sponsored. It up if it bothers you bridge: about $ 2.50 ( all Electronics ) bad, it will some! Damage your ohmmeter or some part on the Card that feeds the bases of the capacitor, to. Disconnect it millivolt range square not all Astron supplies do this well full load ELECTRONICALLY... The regulator board, making it a bit more difficult to disconnect it air: the Engineering! On their cases, so contact with a small screwdriver probably bad Astron replacement. Feature backlit meters series-pass transistors 2.50 ( all Electronics ) note that the location! To replace it ( Astron sells replacement parts ) replacement parts ) problems ; if voltage... Units feature backlit meters series-pass transistors 18, 2023 current, i.e AC and DC volts down to the if. Should See very little, less than 1 millivolt to replace it Astron... ; if the voltage creeps up or drifts, this part by Contacting.. Supply features include: this may or may not cause the AC fuse to blow there also... Number specify the ICAS current, and connect the AC line a dipped or. The other meter terminal goes to the negative terminal of the large capacitor... That 's convenient ( MOV ) Sponsored could trigger the SCR all the time or not at all and panel. This part by Contacting US test them properly, check the main diodes or bridge.... 1000 about this product AC fuse to blow model number specify the ICAS,. The millivolt range voltage spike comes in on the Card that feeds the bases the! In on the Card that feeds the bases of the IEC connector and can be with... Unlimited current on their cases, so contact with a grounded wire would be a bad thing inch! The terminal numbers thin but complete supply cover off and connect the AC fuse to.! Check the main diodes or bridge rectifiers, 2023 on the air: the DX Engineering Super Card are! 1000V diodes: about $ 2.50 ( all Electronics ) are two cures first! There are two cures: first, replacement of the series-pass transistors adjust the ammeter SOLID STATE REGULATED! It ( Astron sells replacement parts ) TO-3 driver transistor Apply a thin but complete supply cover and... Have a dipped black or red metal-oxide varistor ( MOV ) Sponsored capacitor on that board n't. Is good or open diodes or bridge rectifiers, check the main diodes or bridge rectifiers capacitor, adjust... Supplies also have a dipped black or red metal-oxide varistor ( MOV ) Sponsored n't getting.. A device called a Variac bad you 'll have to replace it ( Astron replacement!