Those links are from 2005 so almost 20 years ago..
the link takes me to imageshack asking me to sign up... not going to happen.
JR
the link takes me to imageshack asking me to sign up... not going to happen.
JR
AT 4060 schematic?
- Thread starter DrFrankencopter
- Start date
Help Support GroupDIY Audio Forum:
The 4060 and associated PSU schemos are in the Tech Docs since 2017
maxwall
Well-known member
- Joined
- Nov 17, 2004
- Messages
- 1,134
AT4060 PSU Link HERE , but the document is unreadable unfortunately.
Original Thread HERE
Possibly a schematic like this can be used to create a new psu for the At4060 with minimal circuit changes in B+ (120vdc) , since the At 4060 mic accepts 120vdc Plate voltage and 6.3vdc Filament voltage. Plate voltage below would be single output Mosfet (IRF740) regulated at 120vdc with current requirement from 5-10ma min. The 6922 tube for the filament has a current requirement of ~ 300-365ma. Also regulated by NPN pass transistors found the original AT8560 PSU schematic, but in this case LM317 is used , in some instances as a current source regulator rather than a voltage regulator.
I have Sterling PSM169 psu that originally powered a 6205 sub-mini tube filament supplied ~ 100ma, However , I'm tying to convert the LM317 CCS ( constant current source) filament circuit in this supply to deliver more current for a 6922 tube , but having difficulty stabilizing the filament voltage to 6.3v after changing the 15ohm 5w resistor to 3.9ohms 3w (R1). CCS Calculator HERE This resistor is positioned on the adj (pin 2) leg of the LM317 regulator - see circuit below. I have also tried different power transformers ranging from 8vac up to 16vac. Apparently, the filament transformer must be 5v higher than what is required on the Vout. I do not have access to a schematic for the PSM169 and will have to draw one out. As a Dummy load, I test only using one 12au7 tube tapping the filaments in parallel configuration which simulates a ~300ma load . B+ not applied to the HV section of the psu pcb. PSU circuit below is Rode NTK tube mic which powers a 6922 tube. Closest circuit I could find that used the 6922 tube, like the Audio Technica At4060 tube mic ( 6922 tube ).
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