Tremolo TMB Reverb with 6AQ5 tubes
Posted: Mon 02/20/23 4:41 am
Howdie!
Yesterday I was experimenting with 6AQ5 tubes in the power section of my recent Tremolo TMB Ironside amp. I must say I was very impressed with the sound. There seemed to be more OD on tap and a little less headroom and overall volume. I liked the way they both thickened the sound and gave it a very sweet high end.
Because the 6AQ5 require a max anode voltage of 250V I had to use the 0-190V tap on my PT. (275-190-0 secondary). I landed on Va 206V Vk 6V and Rk 56R, which gave me about 80% dissipation and a very nice and sweet growl.
When I was about to wrap things up I thought of trying the tremolo first.. bummer! There was nearly no tremolo at all!
So, by means of the experiment... what if I split the B+ after the rectifier, using a string of 5W zeners to scale down the B+ for the power tubes and the PI AND a separate branch with all filter caps for the preamp. Do I use another can cap 32+32uf 500V to filter the juice for the preamp? Or is using only 1x 47uf 500V + 2x 22uf for nodes D and E plenty enough filtering?
Or is there a better way to tweak the extra voltage I'm lacking for V1?
EDIT: Since I've still got some slack on the B+ I am gonna try to set the voltage with the 0-275V secondary.. zener it down until I have Va around 250V and see if that voltage is ok for the tremolo to work as intended.
Yesterday I was experimenting with 6AQ5 tubes in the power section of my recent Tremolo TMB Ironside amp. I must say I was very impressed with the sound. There seemed to be more OD on tap and a little less headroom and overall volume. I liked the way they both thickened the sound and gave it a very sweet high end.
Because the 6AQ5 require a max anode voltage of 250V I had to use the 0-190V tap on my PT. (275-190-0 secondary). I landed on Va 206V Vk 6V and Rk 56R, which gave me about 80% dissipation and a very nice and sweet growl.
When I was about to wrap things up I thought of trying the tremolo first.. bummer! There was nearly no tremolo at all!
So, by means of the experiment... what if I split the B+ after the rectifier, using a string of 5W zeners to scale down the B+ for the power tubes and the PI AND a separate branch with all filter caps for the preamp. Do I use another can cap 32+32uf 500V to filter the juice for the preamp? Or is using only 1x 47uf 500V + 2x 22uf for nodes D and E plenty enough filtering?
Or is there a better way to tweak the extra voltage I'm lacking for V1?
EDIT: Since I've still got some slack on the B+ I am gonna try to set the voltage with the 0-275V secondary.. zener it down until I have Va around 250V and see if that voltage is ok for the tremolo to work as intended.