Question about Peavey AMPLIFIER, 1000 WPC, DDT, 8/4/2 OHMS => Model PV2000 Car Audio Amplifier

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Low sound on high gain no low gain new tubs

Started amp and found no power out at all thought it was tubes replaced all 7 tubes and did not help cheked all fuses all good checked all conections all look ok all tubes are on and hot and main transformer is only one that is getting hot i dont know if that is right or not ?? cant get a wiring diagram so i dont know what to check next. any help for me?? its a peavey butcher amp.

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Your power transformer should not be getting hot. The signal is not passing to or through the output transformer.Check the speaker connections on the speaker side of the output transformer. Go to geofex.com and check the tube amp debug page.

Posted on Nov 02, 2008

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2 Answers

Amp keeps blowing fuses


Blowing fuses, was caused by many thing.
Short of rectifier,resistor,elco,tube heater,tube pin, and also trafo itself (primary or secondary winding). It must check step by step.
CAUTION :
THIS IS HIGH VOLTAGE AREA.
RISK OF ELECTRIC SHOCK THAT CAN KILL.
DON'T DO THIS IF YOU ARE NOT TECHNICIAN OR NOT FAMILIAR WITH VACUM TUBE CIRCUIT. THE CIRCUIT MAY STILL CONTAINS ELECTRIC SHOCK EVEN IF IF THE AMP IS NOT POWER PLUGGED.


The simple steps (see picture) are:
  1. Disconnect all connection from secondary of power trafo (PLV,PDCH,PACH and PHV).
    Power ON the amp. If fuse is not blowing,trafo is good.
  2. Power OFF the amp. Unplug the cord.
    Connect PLV1-PLV2-PLV3 (this are Bias voltage,+/-15VDC and Backlight PCB voltage) to power trafo.Power ON the amp. If fuse is not blowing,PLV circuit is good.If fuse blowing,there are parts is damage (dioda,elco,7815/7915,resistor) in this PLV circuit.
  3. If step 2 is good,go to next step.
    Power OFF the amp. Unplug the cord.
    With PLV circuit stay connected,connect PDCH 1-2 and PACH 1-2 to power trafo. Power ON the amp.
    If fuse is not blowing,PDCH and PACH circuit is good and all tubes heater/filaments are lights after a few seconds.
    If fuse blowing,there are parts is damage (dioda,elco,tube heater pins) in this PDCH/PACH circuit.
  4. If step 3 is good,go to next step.
    Power OFF the amp. Unplug the cord.
    With PLV,PDCH,PACH circuit stay connected,connect PHV 1-2 to power trafo.
    Power ON the amp. CAUTION: HIGH VOLTAGE AREA is ON.
    If fuse is not blowing,PHV circuit is good.
    If fuse blowing,there are parts is damage (dioda,elco,tube pins) in this PHV circuit.
.amp-keeps-blowing-fuses-01sk4vtrndbaaguwe2brflsj-5-0.jpg
Notes:
  • Steps had to be done sequentially from 1 to 4, not upside down.
  • If tube/heater pin is short,it can't be repair. The tube must be replacing.
  • PDCH circuit is voltage for V1-2-3-4 heater/filaments.
  • PACH circuit is voltage for V5-6-7 heater/filaments.
  • Always replace fuse with same type.

amp-keeps-blowing-fuses-01sk4vtrndbaaguwe2brflsj-5-1.jpg

Oct 02, 2015 | Peavey 6505 Plus 120W Guitar Amp Head

3 Answers

2001 Mercury Mountaineer keeps blowing the PCM power diode (fuse #19)


Check all of the battery terminals and cables and check the wires on the starter/selonoid, start from the battery and follow the cable out and check all conections , clean and tighten them and if it still does it the starter/selonoid is bad and needs replacement...

Sep 18, 2008 | 2001 Mercury Mountaineer

1 Answer

2008 KAWASAKI 600ZZR FUEL PUMP NOT RUNNING.


I doubt that jump starting your machine would have cooked your fuel pump.Does the machine still turn over if not you may have cooked the E.M.U if so the easiest way to check the fuel pump is to unplug it from the loom useing two suitable lengths of wire conect the pump directly to the battery if the the pump emits hum it is working & you will need to check your wireing for possible burns you say the fuses all checked ok I can only assume that you only cheked the fuses by eye in which case it is not allways easy to tell a fuse is blown by visual inspection the only proof positive way is with a multimeter. Another simple test is to bridge the fuse holder first remove the fuse then useing a short piece of wire (no more than fifteen amp you dont want cook the system if there is a fault elsewhere) bare the wire at each end & place it in where the fuse normaly resides turn on the Ignition if the pump comences to function discard offending fuse insert a new one & of you go. hope you are in the wind again soon

Mar 08, 2010 | 2006 kawasaki ZZR 600

1 Answer

Have a Crate V50-112.Have had it for 1 year. Replaced tubes 2 weeks ago, turned amp on tonight, started to play, amp went dead. Checked fuses, they're good. Any ideas?


Check for bad tube... it HAPPENS that brand new ones fail... USUALLY if they last 50 hours, they will last for the expected life. The bad tube would likely NOT be the main power tubes, as the amp would still run on one cylinder...

Feb 02, 2010 | Crate Music

2 Answers

I have a "peavey ultra 410" guitar amplifier. it has been sitting in the garage for several years, and there is no power when plugged in. The amplifier is all tube (preamp and amp). My question is this; if...


Even though I don't have a schematic, if you have a VOM, (Volt-Ohm, Milli-Ammeter) we can start. Just because tubes are old doesn't mean they are used up. If a tube doesn't light up that would be a bad one, but they are in parallel off a winding of the power transformer. 1.) Check the on/off switch with the ohmmeter and the line cord for conductivity. 2.) Check the primary winding of the transformer for a low ohms reading. (less than ten ohms). 3.) Some where between the power switch and the pwr. trans. should be a fuse. After these three you should be able to put 120vac. to the unit and bring it back on. Get back with us, Dale

Aug 04, 2009 | Audio Players & Recorders

1 Answer

Won't power up


Hi Billy,
Check the capacitors at the top right of the power supply, are any of them swollen? If so replace them & power it up. I have a had a few of these power supplies going dead & have found a few other problems with them as well as the capacitors. Usually I just replace the power board as it saves a lot of time investigating further trouble. The wiring I believe is manufacturing oversight & will not have too much bearing on your problem.

Aug 03, 2009 | Televison & Video

2 Answers

Turned on switch to crate V33-212 and it shorted out


Your amplifier is a solid-state rectified tube amplifier. This means that a tube is NOT used for the power supply. Why is this significant? Because most of the time you have the problem you are describing, it is because of the tube rectifier.
Since this amp does not have a tube rectifier, the problem is likely one or more of the tubes. I have seen in 95% of the amps I repaired that the tubes were the cause, and since the amp is so new, I would suspect tubes first.
Now the hard part: which tube? Without a tube tester, you will have to use the 'firewall' technique. You will need to get a bunch of replacement fuses, as you might go through a few untill you find the problem. Radio Shack is a great place for fuses (make sure they are SLOW BLOW type).
The problem is almost guarenteed to be the power tubes: they are a big failure mode in tube amps (the preamp tubes are not as likely the problem).

This is what I do at a customer site without a tube tester:
(1) Have either a KNOWN TO BE GOOD REPLACEMENT SET OF TUBES or a NEW SET OF TUBES.
(2) Have plenty of fuses.
(3) Start with power tubes: they cause most of these problems. Replace burned out fuse.
(4) Replace all 2 (or 4 in your case) with the good tubes.
(5) Turn on amp and play on it (30 minutes at various volumes and settings). Turn it on and off many times using the on/off procedure your amp requires (like using the standby switch on some models).

* if the amp plays and works, likely you had a bad power tube. If you are blowing fuses, the problem is either the power amp circuitry or the preamp tubes.

* Leave the good power tubes in before going on to the next step. Also: the minor difference in bias wont matter for what we are doing now: the bias being WAY out is almost never the cause.

(6) Check preamp tubes (easy to do, as this does not require us to poke around on the insides).
(7) Replace burned out fuse (atleast number two by this point).
(8) Replace all preamp tubes.
(9) Turn on and repeat step 5.

* Blowing fuses at this point means atleast two types of repairs needed: retention tube sockets or someone to look inside the amp. Either way, this is a serviceman repair (things I do). Since the amp is so new, take the warentee buyout and throw it back to where you got it. Crate is real good about dealing with these issues (if you are the only owner and it is within warantee).

If you need to contact warantee support, you can tell them you have had the amp re-tubed and the problem still persists (meaning they can brush you off with 'just get it retubed and then call us if there is problems'. This is like 'take two asprins and call me in the morning: 95% of all tube amp problems can be fixed by this (retube, not asprins).

If you have to do the warantee route, KEEP YOUR NEW TUBES. The preamp tubes are fine, but the power tubes may be damaged. Wait for what Crate tells you before you use them. This is if you are cheap. I would pitch all of the tubes and consider the 70 bucks as my cheap attempt to bet I am in the 95% solution number (tubes are the cause). Otherwise, the repair will cost shipping at a minumum. Dont you love it: tube amps are expensive and require someone with deep pockets to enjoy the tone. But what can we do: tubes DO sound better and when everything is working, they perform reasonably well.

Good luck on this!
-mike

Mar 24, 2009 | Crate FlexWave FW15 Guitar Amp Combo, 15...

2 Answers

Guitar amp no sound or lighting


Ah yes: complete catastrophe. Usually when everything is not working, it is a single reason and when that single reason is fixed, so is the amp.

Based on what you tell me, I am going to say you have a bad power tube. And I will even go as far to say that you buy a set of tubes and play on them as long as you can. If so, then you not only burned up the tube, but weakened the power section and may have a slooow tube frier. I always tell customers: modern tubes have an effective life of less that 1200 or so hours and that varies. Replace the tubes once per year if you gig with the amp: period. Otherwise, guys like me (doing repairs) stay busy and the tube companies get rich selling tubes to amps with weakened power sections.
It sounds like you burned a power tube and blew a fuse. First, you need a new set of power tubes and some extra fuses (go to Radio Shack and set the value you need in SLOW BLOW fuses).
Then, replace all the power tubes. Don't worry about biasing yet, we are just seeing if there is a problem. Next, replace the fuse.
Turn on the amp and play on it at various volumes and settings. If all is well, take the amp to a tech and get it rebiased. If you can afford it, pay to have the grid/plate and other resistors changed so the power section will be like new (clean slate with new tubes). Your amp will love you for it.
Almost all of the amps I have worked on for performance problems (cant keep tubes to stay alive for very long) are directly related to end user use. When you use a tube until it blows it ALWAYS TAKES SOMETHING WITH THE TUBE WHEN IT GOES (like the power section components). The compents will be weakened and the tubes will 'wear' at different rates that can even move them out of the 20% tolerence they must be within to sound good. 99% of the time a board repair with a retube after a catastrophe fixes the amp until the next time it is 'run into the ground'. Tube amps are NOT invinceble: they are weak compared to solid state and expensive to own. But we love tubes because they sound great. I have solid state to knock around on, when when it counts, I play only with tubes. I have spent hundreds on good tubes because you do get what you pay for.

Hope this helps!
-mike

Mar 14, 2009 | Music

1 Answer

1998gmc tail lights don't work fues is good bulbs are good


There is a Relay for these in the Fuse Box under the Hood. Replace that Relay and you should be Good.

Jan 23, 2009 | 1998 GMC Sierra

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