Shiva 20th tube layout?

[sinestro]

Anyone know what the preamp tube layout is for these? I want to try and dial out some of the top end sizzle with the higher gain settings and would prefer not to do it using trial and error.

 

[just42dave]

V1: Input tube both channels, 12ax7

V2: 2nd stage for Channel 2, 12ax7

V3: 3rd stage for Channel 2, 12ax7

V4: 2nd stage for Channel 1 and FX Send, 12ax7

V5: FX Return, 12ax7

http://www.bogneramplification.com/cust ... vaTube.gif

 

[just42dave]

I took out my sovtek kt88 and it helped alot maybe go to a 12ax7 8th gen since they work best with the chinese

 

[sinestro]

I can't imagine the 88's emphasizing the sizzle as much as the pre's would. I'll swap V2 & V3 around a bit and see if that does it. I do have some 6550's around too, so I may check that out as well.

This links to the whole page:

http://www.bogneramplification.com/cust ... vaTube.php

 

[RSRD]

Agree

 

[just42dave]

Mybe you should read up alil about it on the search system for rig talk and yes sovtek kt88 add to the high ear piercing sounds it makes with them.. A good set of 6550 work great if they will be a high enough number to bias it to..I used Black Sable SED 6550 and sounds beautiful but what do I know lol..

 

[just42dave]

Either way I answered your question ask Steve K and richie d they are really familiar with the 20th.

 

[PSGuitar]

Bumping old thread because I can't find the phase inverter.
I have a 20th Anniversary without reverb.
It has v1, 2, 3, 4, 5, 7
There is no v6.
So, is v7 the PI? My manual doesn't mention 7.
For tonal changes I use 1-2-3 mostly.

 

[John4021]

V6 is the Phase inverter.
V7 is reverb which you said yours doesnt have

The Shiva has 6 preamp tubes (7 in reverb model) which do the following: 1st (closest to input jack) > Ch 1+2 > check that one if your amp gets noisy or microphonic. 2nd+3rd > Ch2 only 4th > one part (triode) Ch 1, second part for the loop send (affects both channels) 5th > loop return (affects both channels) 6th (second row in center of chassis) > phase inverter (affects both channels) 7th (second row towards side of chassis) > reverb Note: If you want to experiment with different tubes the first 3 tubes are the most noticable sound wise.

 

[Ventura]

Shiva Tube Layout

(and Sovtek88 sucked compared to the GL-KT88s - totally made my 20thA go gangbusters - Sovteks were glaring and shrill, not the GenalexGL, they're bouncy, punchy, big and powerful - girth - and it takes the preamp distortion and really keeps it tight and focused...YMMV, but the GL-KT88 PTs with a select few 12AX7s and an LPS in the PI slot - been runnin' it like this since 2016?? Balls out)

 

[Alex_S]

I changed mine to EL34 (which takes a resistor clip) which improved the tone to my ears a lot. But it becomes more "classic" sounding with El34s, so might not be your thing. And as it needs to clip a resistor, I am not sure I should recommend. But another option....