Change Tubes

ManUtd · 8th October 2009, 06:28 PM

Hi,
I purcased a Ming-Da MC368-B90 from www.on9mart.com
and i am VERY happy with it after changing the input Tubes
from electro-harmonix to tubes from Telefunken.
Now i want to change the drivers to but i need to know if i can change
them also without having to adjust BIAS on amplifier?
Original Tubes are electro-harmonix 6SN7×2 and i want to change them
with a NOS pair from Tung-Sol 6SN7WGTA.

Any Suggest?

Thanks,

ManUtd · 8th October 2009, 10:09 PM

Quote:

Originally Posted by ManUtd

Hi,
I purcased a Ming-Da MC368-B90 from www.on9mart.com
and i am VERY happy with it after changing the input Tubes
from electro-harmonix to tubes from Telefunken.
Now i want to change the drivers to but i need to know if i can change
them also without having to adjust BIAS on amplifier?
Original Tubes are electro-harmonix 6SN7×2 and i want to change them
with a NOS pair from Tung-Sol 6SN7WGTA.

Any Suggest?

Thanks,

No respond?
Hmmm, Amplifier operates in Triode or Ultra Linear mode if this is important.
My only Question is: Can i change driver tubes without having to adjust bias?

Ty_Bower · 8th October 2009, 10:15 PM

Changing either the 12AX7 or the 6H8C tubes should have no effect on the biasing of the KT90 power tubes.

8th October 2009, 06:28 PM	#1
ManUtd diyAudio Member Join Date: Sep 2003 Location: Hof,Norway with Nice Mountains!	Change Tubes Hi, I purcased a Ming-Da MC368-B90 from www.on9mart.com and i am VERY happy with it after changing the input Tubes from electro-harmonix to tubes from Telefunken. Now i want to change the drivers to but i need to know if i can change them also without having to adjust BIAS on amplifier? Original Tubes are electro-harmonix 6SN7×2 and i want to change them with a NOS pair from Tung-Sol 6SN7WGTA. Any Suggest? Thanks,

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8th October 2009, 10:15 PM	#3
Ty_Bower diyAudio Member Join Date: Mar 2007 Location: Newark, DE	Changing either the 12AX7 or the 6H8C tubes should have no effect on the biasing of the KT90 power tubes.

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