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1974 FENDER TWIN REVERB HAS NRE TUBES NEW FILTER CAPS AND WAS REPAIRED BY RETIRED AUTHORIZED FENDER TECH. PROBLEM AMP HAS VETY LOW OUTPUT UNTIL YOU CRANK IT TO 8-10 THEN IT SOUNDS HORRIBLE DISTORTED AND LOW NOTES LACK DEFINITION (MUD) WHEN I PLAY AMP AT 5-6 ON MASTER AND PREAMP KNOBS IT HAS HARDLY ANY OUTPUT, PLUS TURN THE GUITAR VOLUME DOWN AND IT SOUNDS LIKE A TRANSISTOR RADIO FROM 1960. HELP TECH SAYS EVERYTHING IS OK ONE OF US IS CRAZY.

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Check the speakers try to connect another speaker.then check the output transformer and the resistances at the bottom of the 6L6 tubes.then check the bases of output tubes and the output tubes matching trimmer if your amp have it.then check change the volume pot.then check the ceramic capacitor i n the input of the last 12ax7 tube in the power amp input.

Posted on Jun 13, 2010

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Hello Ktabbott,
I am going to ask you to do a strange thing, that is check the volume pot (potentiometer), make sure it is an audio taper control and not a linear taper control. This is a common mistake, linear taper pots being used instead of audio taper pots. This is what your problem sounds like.
Thank you,
Shuttle83

Posted on Jul 22, 2008

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This sounds like a power supply problem. The high voltage for the tubes is not right. Either you are missing an amplification stage because this or one of the coupling caps is faulty. I'd have to see the unit itself to give you any more details.

Dan

Posted on Jul 22, 2008

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1 Answer

Wot are the send,return,post out socket for on a prosound 4100 amp


These are all related to using external effects processors, like if you wanted to use a separate reverb unit.
"Send" is the output that gives the un-processed signal to the external device, and "return" receives the signal from the external device.
"Post Out" is an output from the amp that occurs AFTER the send/return jacks on the bus, i.e., if you are using an external reverb unit, the "Post Out" signal will include the reverb fx. If you have a "Pre Out" jack, it's signal will NOT include the reverb fx.

May 08, 2011 | Audio Players & Recorders

1 Answer

I got this old Reverb Amp from cleaning out a house for a real estate agent. I was wondering its worth & how to go about getting it to someone who would like to have it. Thank You Its a Pioneer SR-202...


It's an old 'spring-type' reverb.

http://en.wikipedia.org/wiki/Reverberation#Spring_reverberators

I have one from the mid-70's, long unused. Digital reverb is more predictable and not susceptible to rom vibrations or jarring. There are those who would still want one.

You might put it out on eBay. They don't get much for them.

This auction expires in 2 days. The bidding is $20.50 right now. You might watch it to see what the unit eventually goes for.

http://cgi.ebay.com/Vintage-Pioneer-Reverb-Unit-SR-202w-/260777273468?pt=Vintage_Electronics_R2&hash=item3cb789687c

May 05, 2011 | Audio Players & Recorders

1 Answer

I have a pyle pro pta3000 power amplifier,when i hook it up, one channel works fine and the other channel works intermittenlly.


you either have a cold solder joint or a bad capacitor or a bad input.
if it's only happening from one source, look to the source as the issue - there may be a DC voltage riding on the output into the amp, saturating the input until the caps charge...and if there's a bad cap on the input or output, it may take time for it to stabilize.
Meter the input at zero signal, and meter the output as well looking for DC voltage riding on it.
compare readings at zero signal between channels for discrepancies.
ground both inputs and start metering .
check the low ohm resistors between the output transistors unless it's a hybrid.
when I say transistors I mean mosfets.

Mar 20, 2011 | Pyle Audio Players & Recorders

1 Answer

My Fender Bassman 100 amp keeps buzzing.


Part of the power supply is a filtering stage that completes the conversion from AC current to DC. The "cap" is a capacitor that furnishes voltage to help smooth the alternating current that is left from the rectifier stage. These will start to fail over time. While it is a relatively simple repair for anyone that does this for a living, I would not suggest this as your first repair. Expect a parts cost inthe $20 range plus the local labor rate for the entire repair.

Dan

Dec 04, 2008 | B&K AVR-202

1 Answer

HELLO, just bought a fender HRD 410 AMP AND DISCOVERED THAT THE REVERB DOES NOT FUNCTION ! WHAT'S UP ?


Hi Fenderman.

Damn, you gotta hate that. First thing, do you have any recourse with the outfit you just bought the amp from? I guess not if you are asking in here. There is not a whole lot that stops the reverb in these amps. First things to check would be that the connections to the rev-eb tank are ok, and the cables to them not damages, and the terminations to the RCA plugs are good. Check that the reverb tank is connected thew right way round also. If everything so far checks out, and yourself, or an electronics savvy mate then time to download the circuit from here

Then from there, pull the chassis out of the box, and check/look for dry/cracked solder joints about the reverb Pot, I would check the voltages about U2, TL072, and even just change it out if you are unsure. The reverb tank could also be down, hard to check this easily without swapping it out, if you have(maybe time for the repair shop here) a CRO, then you can sniff off the audio going in and out of the tank to be sure that is it functioning.

Anyway, that is a rundown on what may be wrong with the HRD. If you have any questions, more that happy to answer them and continue to help you out. a FixYa rating is a great reward for my time to talk this through with you. Cheers!

regards
robotek

Nov 10, 2008 | Audio Players & Recorders

1 Answer

I have a new fender twin amp. It keeps cutting out when playing, get really hot and is very noisey


Sounds like you might have a problem in the output stage and that it hasn't completely blown out just yet. I'd expect it to get worse soon, like not working at all or maybe smoke coming out or both. You might consider seeing a repair tech. soon. Good luck.

Nov 04, 2008 | Audio Players & Recorders

1 Answer

Fender deluxe reverb amp keeps blowing tubes


If it's blowing fuses. It probably has a bad output tube.
If it's blowing tubes. It may have a cracked tube socket.  Also may need to be biased by a tech.

Aug 20, 2008 | Audio Players & Recorders

1 Answer

I have a Fender tube amp The Twinn. 4 6l6 2 12at7 and 4 12ax7. Mu reverb is dead and I here some strange oscillation. I suspect the 12at7 in reverb and one 12ax7 Both microphonic and very dem fil. ...


Hi ohmytom

Yes, they could be causing the problem.The filaments are a little hard to see sometimes, you will always get a little microphonic activity about preamp tubes. It may also have failing capacitors depending on how old it is. Is it a "Twin Reverb". Let me know the exact model and we can be a little more specific of the problem and solution. Cheers


regards
robotek

Jul 14, 2008 | Audio Players & Recorders

1 Answer

Have a Fender Twin 57 custom shop reissue, 18 months old, keeps blowing the mains fuse after approx 30/40 into a gig. Amp not overdriven, no external FX used


Hi debdenplace

Blowing fuses at gigs is not a very nice habit. I suspect that you need to retube the output stage. It is the most common cause of fuse blowing. Even though not being overdriven, the life you get out of output tubes relates to volume and time. The higher the levels, the more often they may need to be replaced. Go for the Groove Tube replacements if you can afford them GT6L6GE , but I use a gain matched pair of Sovtek Russian made Electro Harmonix ELH6L6EH in this type of amp. They cost about half as much, are designed with Fender style output stages in mind and do a great job.
I am more than happy to answer any other questions you may have about it, please get back to me here, or use the ASK function to go straight to me :) If you are still unsure, have problems, or we need to look at the situation more deeply, then before you give a rating for this advice, hit the ASK button Thanks for using FixYa, If you consider the advice I have given you as sound, a FixYa rating is a great reward for my efforts to help you. Cheers.

regards robotek

Jul 05, 2008 | Audio Players & Recorders

1 Answer

I am working on a Peavey Classic 30 amplifier. It is completely dead, no sound. All the tubes light up. The 12ax7 tubes don't seem to glow as bright as the L84 power tubes.


Hi directmusic

You can get a circuit diagram from here.

The 12ax7's will not glow as bright as the EL34's . Is just the nature of the tubes. The latter being higher powered and the 12ax7 low power. The EL84's as output tubes will always glow brighter, and often even with a dull blue glow about the plates from the higher voltages made available to them. If the plates them selves are glowing red(inside the EL34's). then you have a bias problem. Be careful running the amp in this condition. Do some static checks with the amp off looking for failed components about the bias and screen control stages. .

Start by checking all the DC voltages first. The circuit diagram i supplied the link for has voltages marked for you to check. A common problem with this amp is the 390 ohm 5 watt resistor going open. A faulty output tube(s) may also have caused this. I would replace the output tubes anyways for a good repair.

I am more than happy to answer any other questions you may have about it, just give me a hoy :) Thanks for using FixYa, If you consider the advice I have given you as sound, a FixYa rating is a great reward for my efforts to help you. Cheers.

regards
robotek





May 29, 2008 | Audio Players & Recorders

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