I am back somewhat feeble now but plan on working on amps again in a limited amount.
Designing a OTL amp that will drive the Caldera planar headphone properly as well as other high impedance phones.
Going to use 7236 or 6336 output tubes with 6J5/L63 drivers better sounding than any 6SN7. might be too high of current to use 6AS7s.
Did build a amp that uses 4 E130L output tubes to drive the Caldara but these are hard to get.
I am back somewhat feeble now but plan on working on amps again in a limited amount.
Designing a OTL amp that will drive the Caldera planar headphone properly as well as other high impedance phones.
Going to use 7236 or 6336 output tubes with 6J5/L63 drivers better sounding than any 6SN7. might be too high of current to use 6AS7s.
Did build a amp that uses 4 E130L output tubes to drive the Caldara but these are hard to get.
Have you taken the bottom off?
Might have a bad plate resistors on the 6SN7. At a point I thought that boutique parts would be better. RONG many unreliable.
I used Amtrans AMRG resistors on the plate load of the 6SN7 many have gone bad drifting when they worm up.
Replace them with a 22K ohm 2watt resistors.
I will get that amp back to you.
My problem now is I am to feeble to pick the amp up in the box.
I will make no more amps with 3 transformers and a couple of chokes just to heavy now.
Glenn
I am back somewhat feeble now but plan on working on amps again in a limited amount.
Designing a OTL amp that will drive the Caldera planar headphone properly as well as other high impedance phones.
Going to use 7236 or 6336 output tubes with 6J5/L63 drivers better sounding than any 6SN7. might be too high of current to use 6AS7s.
Did build a amp that uses 4 E130L output tubes to drive the Caldara but these are hard to get.
I am back somewhat feeble now but plan on working on amps again in a limited amount.
Designing a OTL amp that will drive the Caldera planar headphone properly as well as other high impedance phones.
Going to use 7236 or 6336 output tubes with 6J5/L63 drivers better sounding than any 6SN7. might be too high of current to use 6AS7s.
Did build a amp that uses 4 E130L output tubes to drive the Caldara but these are hard to get.
I am back somewhat feeble now but plan on working on amps again in a limited amount.
Designing a OTL amp that will drive the Caldera planar headphone properly as well as other high impedance phones.
Going to use 7236 or 6336 output tubes with 6J5/L63 drivers better sounding than any 6SN7. might be too high of current to use 6AS7s.
Did build a amp that uses 4 E130L output tubes to drive the Caldara but these are hard to get.
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