Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: pbman1953 on July 26, 2013, 07:18:19 pm
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The amp is an old Traynor YBA-3A super- sometimes when switching on the amp there isn't any sound. After checking all the connections, which are typically fine, and after re-cylcing the amp the sound comes back.
A tech told that it could be a carbonized stand by. Has anyone faced this?
Thanks
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Check for B+ voltages after the standby switch next time it happens.
No B+ then switch is bad.
Brad :icon_biggrin:
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Check for B+ voltages after the standby switch next time it happens.
No B+ then switch is bad.
Brad :icon_biggrin:
First you must have B+ BEFORE the switch
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The amp is an old Traynor YBA-3A super- sometimes when switching on the amp there isn't any sound. After checking all the connections, which are typically fine, and after re-cylcing the amp the sound comes back.
A tech told that it could be a carbonized stand by. Has anyone faced this?
Thanks
Start by Standby switch test .
It could be the fuse and fuse socket too ; Intermittent , but you won't see no heater glow on tubes.
If all tube 's heater glow ;
Checking connections : How you do that ? Just by looking without any skill ?? Old amps could have bad solder in B+ circuit, need to reheat.
Speaker connexion too.
Did you hear a hum at high ( if need) volume when no sound ?
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Actually my tech he also mentioned the B+ and is checking the switch too
Thanks to all!!
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Stand by's can be on the B+ or they can be placed on the B- (read center tap), in theory, all your doing is breaking the circuit.
On a Traynor YBA-3A switch is on the B- , center tap of power transformer.