Tube Amps / Music Electronics
For current discussions, please visit Music Electronics Forum. New: view Recent Searches.
New: visit Schematic Hell!
The sunn still shines online!

Listen to great tunes streaming live right now!

ampage archive

Vintage threads from the first ten years

Search for:  Mode:  
previous: Pete G'day guys,I think I need a... -- 1122367088 View Thread

Re: Bias Marshall TSL60 combo

7/26/2005 6:01 PM
Jack Collins
Re: Bias Marshall TSL60 combo
Yep. You'll lose the highs when your power tubes wear out.  
5 years is a long time for EL34's. I'd say you'll  
definitely notice a tone improvement by installing new ones.  
As far as the biasing procedure goes I grabbed this from Dr. Tubes Website:  
"The EL34 tubes are biassed at 40mA each. To adjust the bias, turn the bias pot (PR1 22k) so that the voltage between pins 1 and 2 of CON2 (BIAS) measure 80mV (= 80mA over 1)"  
Of course you're going to need a digital multimeter to do this.  
I'd recommend you try some of the new JJecc803s in your preamp. I have em in my Rivera and love em.  
IMHO, Sovtek 12ax7 have just about the deadest tone of any tube of that type. They are rugged though.

Pete Thanks! -- 7/28/2005 6:51 PM