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How to Bias the Yarland FV-34A tube amp?

post #1 of 7
Thread Starter 

HELP!

 

Are there any owners of Yarland Manual Bias tube amps (E.g. FV34A, PRO88SE or PRO845SE) out there?

 

Please share with me on the proper steps to bias the output tubes.

 

I have the English manual but the English is so badly mangled that it does not make any sense to me at all!

 

Thanks for your help.

 

post #2 of 7

Didn't you get enough information from the other place you posted this question? 

post #3 of 7
Thread Starter 
Quote:
Originally Posted by ebmp19 View Post

Didn't you get enough information from the other place you posted this question? 


Nope.

 

That info didn't help me at all.

 

post #4 of 7

I guess ask a question there because there doesn't seem to be a whole lot of response here. The person  there seems to know what he is doing...

post #5 of 7
Thread Starter 
Quote:
Originally Posted by ebmp19 View Post

I guess ask a question there because there doesn't seem to be a whole lot of response here. The person  there seems to know what he is doing...


Yes he does.

H/W, the amp is such that only a fellow owner would know what I'm talking about.

 

BTW, an English (as in proper English) speaking authorised distributor finally answered my query via e-mail.

 

So if anyone ever needs to know how to bias this amp, please feel free to PM me.

post #6 of 7

Hi i am keen to know what you know about biasing these amps!!!!!!    please reply!!!!

post #7 of 7
Thread Starter 
Quote:
Originally Posted by ynot75 View Post

Hi i am keen to know what you know about biasing these amps!!!!!!    please reply!!!!

Hi,

At each side of the amp, near the front , you can see 4 holes.
There are 3 vertically aligned and 1 other hole by itself.

For measurement:
Stick your multimeter's leads into the middle and bottom of the 3 holes.
The setting should be in mVolts dc setting.

For adjustment:
Stick a small flat jeweller's screwdriver into the single 1 hole by itself.
For EL34 tubes, you need to adjust till you get a reading of 0.70 mVolts.
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