[HAM] (UPDATED) OT: Traynor YGM-3 Guitarmate Amp

[Daniel Ramirez]

I was playing around with it a bit yesterday and the arcing on pin 7 of the EL84/the blue wire of the transformer occurs when a loud note is sounded. It seems it can sit happy when there is little or no input signal, but when I hammer a low note, fireworks.  I guess I'll order some new .1Mf 400V caps and see if that helps.

-----Original Message-----
From: hammond-bounces at zeni.net on behalf of Kip Amore
Sent: Thu 4/10/2008 10:59 PM
To: The Hammond Forum
Subject: Re: [HAM] (UPDATED) OT: Traynor YGM-3 Guitarmate Amp
 
I'm leaning toward power supply issues myself. Luckily, the Traynor is  
about as straitforward as it gets. In fact, armed with a schematic and  
a Mouser catalog, you could pretty much build another one. You can  
certainly "shotgun" components until you find the culprit. It's worth  
it, those are great amps. I believe Traynor eventually became Yorkville.
Kip


On Apr 10, 2008, at 10:38 AM, Scott Hawthorn wrote:

> At 08:13 PM 4/9/2008, Daniel Ramirez wrote:
>> Well, A small white-hot fire started on pin 7 of one of the EL84s
>> today.  Perhaps if one of you tech geniuses looks at the schematic
>> (http://www.lynx.bc.ca/~jc/730911_YGM3_4.gif) it will be apparent  
>> what the
>> problem is. While we are at it, if anyone could recommend some good  
>> study
>> material on audio electronic theory I'd appreciate it.  I am pretty  
>> quick
>> with this stuff, always shined in physics classes, but I still  
>> can't look
>> at a circuit diagram and really "get"what everything is doing.
>>
>> Thanks a lot,
>> dan
>
> Until an actual "tech genius" responds, I'd replace the electrolytic  
> power
> supply caps as a start. There's a good chance they are shot after  
> thirty
> years, and they do supply voltage to the center tap of the output  
> tranny,
> and hence to those tubes. After that, check the voltages as  
> specified on
> the schematic.
>
>
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