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FDP Forum / Fender Amps: Vintage (before 1985) / tube and bias question

Ryder
Contributing Member
**********
******

Northwest Missouri

Butterscotch Blues
Feb 6th, 2012 11:57 AM   Edit   Profile   Print Topic   Search Topic

This relates to my 68 PR tube blower thread.

First, I'm going to try a new rectifier tube. Where to buy?

Second, does the amp need to be re-biased after that?

Third, if I put in two new power tubes, the same brand 6V6's, as are in the amp now...does it need to be re-biased?

Thanks

blues74

EU

"...gonna be a magic boy..."
Feb 6th, 2012 02:02 PM   Edit   Profile   Print Topic   Search Topic

"Need" is always relative. But checking bias after changing tubes is pretty much standard procedure.

Hammond101
Contributing Member
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So. Cal. USA

Feb 6th, 2012 03:50 PM   Edit   Profile   Print Topic   Search Topic

After reviewing your fuse blower thread I would definately check bias on your '68 PR. I would also consider a cap job if it has not recently been serviced. 44 years is a long time. Filter cap can and bias cap for sure. Intermitant fuse blowing is a sign of week filter caps IMO. Tube issues too so you are on the right track.

I would have all the voltages checked in that thing as well.

I've been buying all my tubes from FDP sponsor AES.

Ryder
Contributing Member
**********
******

Northwest Missouri

Butterscotch Blues
Feb 7th, 2012 06:11 AM   Edit   Profile   Print Topic   Search Topic

The amp was serviced by Vintage Jon 3 years ago. That's why I was thinking tubes.

FDP Forum / Fender Amps: Vintage (before 1985) / tube and bias question




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