Which 12AX7 Combo for My Modded JCM800

[Junk Yard Dog]

I have a modded Eggie Seminar head with a JCM800 circuit and need 4 new preamps tubes.

It's a bright, aggressive amp, and very high gain. I need to tame the brightness a bit, but want good punch and clarity.

V1 - V4: JJ's / Tung Sol / Mullard RI / Sovtek LPS (PI) ???

What do you recommend? Thx!!

 

[Kapo_Polenton]

v1 RFT NOS, JJ for the other 3

 

[jsp]

JJ's will help tame the brightness.

 

[Junk Yard Dog]

Will look for an RfT.

Was thinking

V1 (preamp) - JJ
V2 (preamp) - Tung Sol
V3 (FX loop) - 12AT7 or 12AU7 ??
V4 (PI) - 12AX7 or 12AT7 ??

Thanks!!

 

[Meathead]

I would go all Tung Sol in the preamp...to tame the brightness, I would look at a speaker change.

 

[Junk Yard Dog]

All 12AX7?

 

[jsp]

Tung Sols are pretty balanced. They have a decent amount of treble and won't really tame brightness. I'd try JJ ECC83s in the first 3 slots, and an ECC81 (12AT7) in the PI.

 

[sg guy]

Tung Sols are pretty balanced. They have a decent amount of treble and won't really tame brightness. I'd try JJ ECC83s in the first 3 slots, and an ECC81 (12AT7) in the PI.

yup.

definatley a jj ecc83s in v1

but maybe nos rca in v2 etc.

every high gain head I have ever had ...loved a low gain preamp tube in the v1 hole

 

[suhrimmetal]

Agreed.... JJ in V1, Chinese Gens 12ax7 in the rest.

And I would look at speakers... Greenbacks will help smooth things out. Also play with treble and roll it back to smooth things out but don't 'blanket' the amp. Good luck

 

[Junk Yard Dog]

So no 12at or 12au 7 for the effects loop nor PI?

Thanks, guys!