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Changed tubes in my traynor voice master amp to el34s worked fine a week later amp lights up but no sound from speakers everything appears to be working

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Make sure the tubes are seated firmly. If that does not do it take it to a audio repair tech. Could be a variety of things.

Posted on Jun 18, 2009

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1 Answer

I bought this amp. It switches on. It crackles and pops through the speakers and headphones. I disconnected the speakers. It keeps doing it through the headphones.


Hi George:
Old amp volume and tone controls are "pots" or potentiometers. They actually have contact points in them. If you can clean them you should get rid of a lot of the noise. Your local music store may be able to coach you. Old amps can be every bit as good as the newer ones. I have a 1950's Traynor tube model. Gotta luv it! Rock on.

Mar 15, 2015 | Vintage Audio Players & Recorders

1 Answer

I have a Crate CR212 it started to hum/buzz today. It would not play out any sounds other than the noise. I unplugged everything and still it hummed. I unplugged the unit, check the fuse and replugged and...


Are all the tubes lighting up? they should glow like dim light bulbs. If not, replace them with the same model type (12ax7, or EL34 for example).

Often there are two fuses, one to protect the speaker and another to protect everything, it sounds like the latter fuse may be burned out. take it out and take it to radio Shack for exact replacement.

Oct 12, 2013 | Crate Music

1 Answer

Brake problems


Ask those questions at a repair shop
Your son doesn't have the knowlegdge
to resolve
Replacing a master cylinder & bleeding brakes
more than once, tells me he is lost

Jun 20, 2013 | 1997 Ford Expedition

1 Answer

What kind of el34 for my jtm610 marshall to obtain more bite and SUSTAIN.I play a gibson Les Paul Standard. DAVY


It is UNLIKELY you will notice any difference trying different brands of tubes.

The sound will be most affected by the audio output transformer and especially speakers. The transformers in many of these have too little iron in them resulting in saturation. You can spend a lot of money on new tubes and any apparent change you notice will probably be psychological rather than actual.

The design of vacuum tube amps will often result in a softer high ends... If you want more than that, go to the solid state amps. Sustain is affected by the overall gain which is mostly in the preamp and reverb functions AND a large part on the quality of strings on your guitar...

May 31, 2010 | Marshall 15 Watt Guitar Amp

1 Answer

No sound coming out of speakers when turned on


If you get absolutely no sound, not even a pop when changing the standby switch, this probably means the rectifier OR the switch has failed. The red light just means power is getting to the power transformer... probably fuse is OK.

Sep 27, 2009 | Peavey Music

1 Answer

New speakers required?


Possibly, however if output from ME50 is to "hot", that might be some of the culprit (overdriving input)

Sep 14, 2009 | Gibson Robot Flying V LTD RM

1 Answer

JCM2000 DSL100 No Sound


Not likely to be a fuse. The bane of electrical amps are the connectors.

Often the speaker and more commonly the input 1/4 inch connectors go bad. Sometimes caused by side loads when cables are yanked or tripped over.

Be careful of running amps IF the speakers are not connected OR have bad connectors or cables. You can arc over the tubes or pop transistors.

Get a cheap Volt-ohmeter from HarborFreight or Radio Shack and test your cables and connectors.

For a tube amp, your should find relatively low resistance at the speaker connector (certainly under 20 ohms). Do this with power off.

Sep 09, 2009 | Marshall Music

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

1 Answer

No sound from a sony stereo receiver.


Hi there

Have you checked that the speaker on/off switches have not been bumped also. They are often at the left hand end of the amp next to the power switch and easy to turn on. A Tape monitor switch engaged will also give you those symptoms. Check them out and get back to me here if you cant find the problem

regards
Graeme

Apr 06, 2008 | Audio Players & Recorders

1 Answer

Sub does not fully work


My guess is that one of your subs has a damaged voice coil, which acts like a short circuit to the speaker outputs. If you put an ohmmeter on the speaker terminals you should measure a resistance of not much less than 2 ohms (assuming you've wired the VC's in parallel). If you measure a significantly lower resistance then you have a damaged subwoofer.

Mar 13, 2007 | DHD NTX-6812 Car Subwoofer

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