bhjazz
Headphoneus Supremus
- Joined
- Dec 29, 2003
- Posts
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Quote:
Hi guys,
I'm purchasing a Bijou from a fellow member and would like to know what needs to be done to be able to switch from ECC99's to 12BH7 power tubes.
There's more of a variety of 12BH7's (as well as other models) to go through some tube rolling. I know some rewiring needs to be done on the heater elements.
Any info would be appreciated.
Thanks
Thomas
Hey there, Thomas,
For starters, you should read up at the designer's site about the Bijou if you haven't already. That is here.
However, regarding moving to 12XXX tubes Alex says,
"...WARNING: Do not use tubes which have a heater tap on pin 9. This includes all of the popular 12XXX series tubes. The Bijou amplifier board has pin 9, the internal shield in the 6922, grounded to reduce noise. Using tubes with a heater tap at pin 9 will damage the heater biasing circuit and, possibly, cause other problems."
Might be more work that you are expecting. Good luck. Be safe!