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Post subject: Replacing Tubes in Fender Princeton Recording Amp
Posted: Tue Nov 13, 2007 11:02 am
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Hi There,

I want to replace all the tubes in my Fender Princeton Recording amp with JJ's.

I've read conflicting opinions on whether rebiasing needs doing or not, so maybe someone at Fender can give me some advice?

I have the following new tubes ready to put in.

2x 6V6S JJ's
3x ECC 83 S JJ's
1x ECC 81 JJ's.

These I believe are straight replacements for the Groove Tubes already in the amp.

Not being too technical can I just replace them myself, without the need to rebiase?

Thanks In Advance,
Scott


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Posted: Tue Nov 13, 2007 2:52 pm
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From my understanding - You only need to rebias when changing the output tubes. This is why they come in "matched pairs" "duos & quads", etc.


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Posted: Tue Nov 13, 2007 4:15 pm
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Hi Greg,
Scuse the ignorance but what are the power tubes?
I thought the 6V6S's are the power tubes?

I've never done this before so don't really know, but before I take it to a techie bloke I want to make sure it's not something I can't do myself, for free....

CHeers
SCott


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Posted: Wed Nov 14, 2007 9:43 am
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Further to this, a shop in New York tells me that the Princeton don't have the facility to rebiase it, so it's necessary to have some tubes specially 'matched' for it.

Can someone at Fender clarify this for me please, as this is getting confusing now.

THanks

Scott


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Posted: Thu Nov 15, 2007 12:29 pm
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No worries anyone/everyone,

I've spoken to a chap in the UK, an expert, and he tells me every amp needs some form of rebiasing whenever tubes are changed, as it's a very important aspect of keeping the amp running as accurately as possible.

So consider this- If you want to retube your amp, always get it taken to a techie bloke, as I have found, it's not a straightforward job for a musician such as you or I, more a skilled engineering job.

But you probably already knew that.

Cheers
Scott


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