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Spitfire - hum on standby

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sliberty

Post subject: Spitfire - hum on standby

Posted: Thu Apr 13, 2006 2:15 pm

Joined: Sat Jun 25, 2005 5:49 pm
Posts: 5

I built a Spitfire using a salvaged chassis and output trannie. The amp sounds great, and I am thrilled with the results. The original didn't have a standby switch of course, but I decided to add one to my build, so I inserted a switch in between pin 8 of the 5AR4 and the first filter cap. When I power on the amp with the standby switch open, after a few seconds I hear a little bit of hum coming from the speaker cab. Guitar sounds don't play of course, and the controls (volume, tone, master) have no effect on this hum.

What would cause this?

Steve

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Legin

Post subject:

Posted: Thu Apr 13, 2006 6:56 pm

Expert

Joined: Sat Jun 11, 2005 6:34 pm
Posts: 746
Location: 31Â°45'32.69"S 115Â°46'51.29"E Perth, Australia

Are you taking the tap for your OT before or after the standby switch?

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sliberty

Post subject:

Posted: Fri Apr 14, 2006 9:00 am

Joined: Sat Jun 25, 2005 5:49 pm
Posts: 5

Legin wrote:

Are you taking the tap for your OT before or after the standby switch?

Ding Ding Ding Ding Ding......

Thats exactly what the problem was - thanks for the tip. I moved the OT center tap to be after the switch, and now, when on standby, all is quiet.

Thanks so much!

Steve

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