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Tubes suggestions for Ampeg V4BH?


slick_tu

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Anyone have suggestions for power and preamp tubes for an Ampeg V4BH? What have you tried and what tone did you get? Clean? Dirty? My amp's new, but I've heard the tubes the factory installs (Sovtek 5881WXT's and Goove Tubes 12AX7's - don't know who made the GT's) aren't the best for tone. I'd appreciate any advice.

 

Has anyone tried setting the bias themselves after changing power tubes? Is this something we can do or do we really need a shop to do it?

 

Thanks all, in advance.

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Originally posted by Thumper

Welcome to the Forum!
:wave:

Here's one option for a retube set:


http://www.fliptops.net/catalog/product_info.php?cPath=24_64&products_id=458


You can buy a set of biased power tubes---most sets are sold biased or matched (same thing). I'm not sure about home biasing, so I'll leave that to others to respond.

 

 

the V4BH has 6l6 in it . I think you would need mod it to run those 7027A.

 

I use Philips 7581's in mine strongest 6l6 type there is ;)

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Originally posted by Thumper

Welcome to the Forum!
:wave:

Here's one option for a retube set:


http://www.fliptops.net/catalog/product_info.php?cPath=24_64&products_id=458


You can buy a set of biased power tubes---most sets are sold biased or matched (same thing). I'm not sure about home biasing, so I'll leave that to others to respond.

 

Those are for the original V4B which is altogether different. The Sovtek 5881s aren't bad but I'd recommend EH 12AX7s. They sound great and are cheap. Matching means the pairs of tubes conduct nearly identically. Biasing is done regardless of the tubes being matched. Even a single tube needs to have the correct bias.

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Ampeg will email you the schematic if you need them

here's the main board , the trimmer is bottom center with the + in the center , sorry I don't have photoshop to highlight it

mainboard.jpg

 

here's the trimmer again

trimmer.jpg

 

here's a Bias King

http://biasking.com/

 

and here is a cheaper alternative

https://taweber.powweb.com/biasrite/br_page.htm

 

I highly recommend you have a tech walk you through it the first time . ;)

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  • 6 years later...
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Hi Fretless

i'm andrew from Venice Italy, i have found this post that is old but is the only that i have found.I am trying to locate the bias trimmer on my V4BH, the photo you have posted are no longer visibile, can you send me a photo where i can see where is the bias trimmer?

Thank you very much for your patience

 

Andrea

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