mike

Re: Official Universal Passive Tube PSU Thread
« Reply #80 on: June 03, 2018, 04:16:56 PM »
Nevermind,  I figured it out. Heater -  needed to be jumpered to ground. Now the heater is working. PSU calibrated, NOS tube installed and it sounds freaking amazing!


Re: Official Universal Passive Tube PSU Thread
« Reply #81 on: January 24, 2019, 06:16:07 AM »
I am thinking that I am going to upgrade the PSU for Telefunken AK-47 (not MKII).
What resistors values on R1 and R2 should I use for them?
They has about +150vdc at psu out for B+ when I measured.
« Last Edit: January 24, 2019, 12:21:21 PM by hikowinter »

TLRT

Re: Official Universal Passive Tube PSU Thread
« Reply #82 on: January 24, 2019, 10:11:27 AM »
I am thinking that I am going to upgrade the PSU for Telefunken AK-47 (not MKII).
What resistors values on R1 and R2 should I use for them?
They has about +150vd at psu out for B+ when I measured.

Sounds too high, did you measured with the mic connected?

Re: Official Universal Passive Tube PSU Thread
« Reply #83 on: January 24, 2019, 12:20:30 PM »
Sounds too high, did you measured with the mic connected?

yes, I was connecting the mic.
At the PSU out B+ was 148vdc and 60vdc at before the capsule.
Is it wrong?
It has 5840 tube.
« Last Edit: January 28, 2019, 01:29:47 AM by hikowinter »

Re: Official Universal Passive Tube PSU Thread
« Reply #84 on: May 23, 2019, 03:03:32 AM »
I am thinking that I am going to upgrade the PSU for Telefunken AK-47 (not MKII).
What resistors values on R1 and R2 should I use for them?
They has about +150vdc at psu out for B+ when I measured.

I have assembled this psu using specified parts and works great.
I could adjust for some required voltages.