Reverend Kingsnake 20/60 schematic?

[Steve A.]

A friend just showed me his Reverend Kingsnake 20/60 (in his trunk- I didn't get to listen to it. ) I was interested in seeing what Dennis Kager came up with in this amp which was discontinued in ~2005 after Reverend made about 100 of them. My friend's amp had a Jensen Neo speaker in it- I was wondering if that came stock or was added on later. The amp is a nice friendly weight.

Thanks

Steve Ahola

[Jazz P Bass]

Revernd Kingsnake 20/60 Schematic

I found this.
I hope is the correct one.

[Steve A.]

I found this.
I hope is the correct one.

Thanks! I was mainly wondering about the 20/60 watt switch. For the 20W setting it looks like Dennis Kager placed a 68k resistor across the output signal from the .022uF coupling caps from the phase inverter. Like the most basic post-inverter master volume control which puts a 1M pot across the inputs to the power tube grid stoppers (Ken Fischer calls it a Type 3 MV in The Trainwreck Pages- required reading for Tube Amps 101!) That should work fine- the problem with that style MV is that when you turn it way down the symmetrical part of the signal is canceled out making the assymmetrical artifacts more prominent.

Another question had to do with US/UK/Psycho switch. I see that it reconfigures the cathode circuitry of the initial gain stage. There is a 15k Rk resistor and a .001uF Ck cap hardwired from the cathode to ground. The 3 way switch will optionally add in a 0.01uF Ck cap- in one position (Psycho?) it is connected directly to ground. In the US mode it is not connected at all and in the UK position it is run in series through a 6k8 resistor. It is shown connected to a relay K1. Are there 3 position relays used in amps (with the middle position not connected)?

One other question was how he added in the reverb circuit. The second stage plate has a .022uF coupling cap followed by a 470k reverb splitter (the reverb input taken from the input side of the resistor and the reverb output connected to the output side). Same as the Pignose G60VR (the schematic I have of that has very thick lines and I could not decipher it before.)

It makes more sense to me than the arrangement in the Fender Reverb amps with the 3M3 splitter bypassed with the 10pF cap. With the Kager design when the reverb is set to 0 there is no degradation of the signal by running it through a 3M3/10pF reverb splitter like in the Fender design. When I rewired the preamp of my Fender Pro Reverb amp to the Dennis Kager/Pignose G40V design back in 1999 it sounded like crap running through the 3M3/10pF splitter so I wired it up to bypass the recovery stage with a coupling cap just like the Normal channel (only I had my Normal channel rewired as the clean channel of an ODS going to the reverb circuit.) Voila!

BTW Dennis Kager was the OTHER ex-employee of Ampeg who went on to form his own amp company- not quite as well known as Ken Fischer but between the two of them there are a LOT of good ideas for DIY-ers to check out.

Thanks!

Steve Ahola

P.S. I just found a very legible copy of the G60VRH (H for head?) schematic which on first glance looks identical to the Kingsnake 20/60 except for lacking the Schizo/US/UK switch and the 20W setting.

pignose-g60vrh-amplifier-schematic.pdf

[rf7]

Bump! Schematic is unavailable now.

[Jazz P Bass]

http://www.themondellos.com/gear/KIN...-SCHEMATIC.pdf

[rf7]

Jazz, thanks so much!