Silver Alligator schematic doubt

[grtamp]

Hi, watching silver alligator schematic I have some doubt about the tube of the 2nd stage, it's a 12ax7 ?
, the first triode has 1,8k cathode Res!.this is ok or can be 1,5k?
Thanks

[Bombacaototal]

Its a 7247 = 12dw7

[grtamp]

It makes no sense a 12dw7 in there. 12dw7 has 1/2 triode can handling much current. what is his function in that configuration?
R.

[M Fowler]

http://ampgarage.com/forum/viewtopic.ph ... sc&start=0

States first Pentode was wired as a triode and 2nd Pentode was wired as a pentode. Using EF86 tubes.

[grtamp]

M fowler , I'm talkin about 12dw7!!

The tube has 2 different triode , what's the first and what's the second in the schematic?

[Aaron]

The 12DW7 is third stage!!!!!!!!

1st stage: EF86 wired triode
2nd stage: EF86 wired pentode
3rd stage: 12DW7 mixer circuit

Aaron

[M Fowler]

And if you want the gain structure different from the Ecc832-12DW7 order the Ecc823 which is reversed pins 123 = 12AX7 and pins 678 = 12AU7.

[grtamp]

Sorry Aaron, misunderstanding about the stage!
Yes I'm talking about 3rd. stage , the mixer !

On the schematic there's no number of pin!
12ax7 1st. triode and 12au7 2nd.?

[Aaron]

Sorry Aaron, misunderstanding about the stage!
Yes I'm talking about 3rd. stage , the mixer !

On the schematic there's no number of pin!
12ax7 1st. triode and 12au7 2nd.?

Should be 12AX7 pins 678, into 12AU7 123.

Aaron

P.S:- can we all stop yelling!!

[grtamp]

Thanks Aaron!
The 1,8k cathode Res. is a confirmed value or not?

R.

[Aaron]

I would say 1k5, same with the reveb return. It's probably just labelled wrong from when I drew the schematic, a lot of copy and paste.

Aaron