6BG6 for KT66

exurbia · 22nd November 2008, 08:37 AM

Is the 6BG6 a direct sub for the KT66 ? My Riders tube sub book doesn't give an answer to this one.
TIA,
Peter.

ErikdeBest · 22nd November 2008, 11:54 AM

Hi Peter

As far as my memory goes, the 6BG6 is an octal version of the 6L6 with a different pinout and a topcap. That makes it a sister of the 807, which I know has been succesfully implemented in Quad 2 amplifiers, which originally employed KT66's. So, it should work, but lets wait what others have to say about it!

Erik

Eli Duttman · 22nd November 2008, 01:02 PM

It depends on the vintage. In this case, "recent" is better. The last bunch of 6BG6s made have 6L6GC innards. Older samples can't safely dissipate as much power.

If you get newer production 6BG6 stock, they are quite suitable (electrically) as KT66 substitutes.

Look here for more details.

exurbia · 23rd November 2008, 03:41 AM

thanks for the help with this one, i have a pair of old williamson amps that run kt66's.
i have quite a stock of "old" 6BG6G's which is why i asked the question.
What if i drop the HT by a couple of volts would that cut the plate dissipation by enough?

Johan Potgieter · 23rd November 2008, 02:09 PM

Yea, nothing to really add to what Eli has said, except that 6L6 is a very generic term. It was such a successful design that the structure has not really been changed over decades, except for increasing power handling capacity by larger anode area, layered material and improved electrode mounting. Thus one got a 6L6 and 807 (Pa=19W), 6L6GB and 5881 (23W), 6L6GC (30W) and 7027 (35W)

6L6 characteristics are within tube manufacture spread (10%) of KT66, but heater current 40% less. (I notice Russian KT66s use 6L6 innards anyway.)

Eli has given the full picture. (And for myself, for 6BG6 I rather rewired than use the cumbersome adapter.)

22nd November 2008, 08:37 AM	#1
exurbia diyAudio Member Join Date: Jul 2002 Location: Perth	6BG6 for KT66 Is the 6BG6 a direct sub for the KT66 ? My Riders tube sub book doesn't give an answer to this one. TIA, Peter.

22nd November 2008, 11:54 AM	#2
ErikdeBest diyAudio Member Join Date: Mar 2003 Location: Itoculo	Hi Peter As far as my memory goes, the 6BG6 is an octal version of the 6L6 with a different pinout and a topcap. That makes it a sister of the 807, which I know has been succesfully implemented in Quad 2 amplifiers, which originally employed KT66's. So, it should work, but lets wait what others have to say about it! Erik __________________ my surname is indeed 'de Best': neither misspelling nor snobbism! Ask SY!

22nd November 2008, 01:02 PM	#3
Eli Duttman diyAudio Member Join Date: Apr 2004 Location: Plainsboro, NJ	It depends on the vintage. In this case, "recent" is better. The last bunch of 6BG6s made have 6L6GC innards. Older samples can't safely dissipate as much power. If you get newer production 6BG6 stock, they are quite suitable (electrically) as KT66 substitutes. Look here for more details. __________________ Eli D.

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23rd November 2008, 03:41 AM	#4
exurbia diyAudio Member Join Date: Jul 2002 Location: Perth	thanks for the help with this one, i have a pair of old williamson amps that run kt66's. i have quite a stock of "old" 6BG6G's which is why i asked the question. What if i drop the HT by a couple of volts would that cut the plate dissipation by enough?

23rd November 2008, 02:09 PM	#5
Johan Potgieter diyAudio Member Join Date: May 2005 Location: Pretoria, South Africa	Yea, nothing to really add to what Eli has said, except that 6L6 is a very generic term. It was such a successful design that the structure has not really been changed over decades, except for increasing power handling capacity by larger anode area, layered material and improved electrode mounting. Thus one got a 6L6 and 807 (Pa=19W), 6L6GB and 5881 (23W), 6L6GC (30W) and 7027 (35W) 6L6 characteristics are within tube manufacture spread (10%) of KT66, but heater current 40% less. (I notice Russian KT66s use 6L6 innards anyway.) Eli has given the full picture. (And for myself, for 6BG6 I rather rewired than use the cumbersome adapter.)

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