[leftside]

Hi All

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.

Will be good to talk to all of you again.
Glenn

Brilliant to see you back here again mate! Totally made my day.

 

[dminches]

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

Glenn, it is great to see you back here and able to work on amps! I hope your health continues to hold steady.

 

[ashwinvyas1981]

I will send you a PM

Sure, I will wait for your message.

 

[wotts]

Hi

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 have the bottom off now. It's on my kitchen counter now. I'll take a look at the resistors. Glad to hear you are up an around!

 

[2359glenn]

I have the bottom off now. It's on my kitchen counter now. I'll take a look at the resistors. Glad to hear you are up an around!

Take a picture of the underside and send it to me.

 

[Phantaminum]

5CU4 is a great rectifier tube for the OTL but draws over 3amps filament current might overheat the transformer in other amps.

Great to see that you’re back Glenn!

 

[smodtactical]

Hi All

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.

Will be good to talk to all of you again.
Glenn

Welcome back all the best for a speedy recovery.

 

[BunnyNamedCraig]

Man glad to hear you’re alive Glenn! Was concerned

 

[robo24]

In my never ending quest for both poverty and maximizing my Glenn OTL, scored 4 WE 421A & Soviet 6S5S. Using Tube Amp Doctor GZ34 as rectifier, which is really similar to (and slightly better than) the Mullard GZ34 as this is a Mullard/Valvo design reproduction. Made sure the old Glenn spreadsheet said 4 of these (or 5998) is just fine. Doubles as a space heater! I shared with Zach that the Atticus with the WE 421A is just mind blowingly good, especially for being their cheapest and oldest model. I spend less and less time with the Atticus as the Verite Closed and Atrium Closed are just so much more detailed, but with the WE they really aren't far behind.