|Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum|
Please consider donating to help us continue to serve you.
Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
||Thread Tools||Search this Thread|
|30th October 2004, 01:12 AM||#1|
Join Date: Jul 2004
Location: Ottawa, Canada
Audio Note DAC Output Transformer Hookup
I've had some honkin big Audio Note Output Transformer's sitting on my desk destined for my AN DAC1.2 for some time and am attempting to add these to the analogue output stage of the DAC.
Instructions I culled from Audio Note kit enthusiasts included (most of the original analogue board being gutted):
- connect plate, grid and cathode halves of valve (in this case, a 6922)
- "black" wire from OT to high voltage
- "red" wire from OT carrying high voltage to plate (pins 1,6)
- signal to grid (pins 2,7)
- bias cathode (pins 3,8) to "+" of (2 in parallel) AA nickel metal hydride batteries, “-” to ground
- "orange" wire from OT to RCA signal (output to pre)
- "blue" wire from OT to RCA ground
- "green" wire from OT to chassis ground
- FIL+ to pin 5
- FIL- to pin 4
- pin 9 to ground
When first attempted on the original kit PCB (cutting required tracks), plate voltage was half what it should have been @ 50V. So I simply wired the circuit on a blank PCB. Now the plate voltage measures 200V (it's 215V off the power supply board) - but we want this to be 100V.
Any ideas? Not sure if the battery bias setup above is correct. Also the signal has a 470R to ground and 220R (grid stopper?) to grid. FIL+ is 6.15V
I'm just doing things by rote here so any advice or direction would be most appreciated.
|Thread Tools||Search this Thread|
|Thread||Thread Starter||Forum||Replies||Last Post|
|Audio Note PSE 300B Output Transformers||mozfet||Swap Meet||7||16th April 2007 06:49 AM|
|FS: Audio Note TRANS-010; Audio Note 20H 50mA choke; Black Gate Wk "power tank"||Joseph0||Swap Meet||1||24th May 2006 05:17 AM|
|Audio Note DAC4 SRPP output stage problems!||bbakota2000||Tubes / Valves||5||12th June 2005 12:25 AM|
|Help needed with Audio Note DAC Output Transformer Hookup||s.hum||Digital Source||0||31st October 2004 01:54 AM|
|Audio Note DAC KIT1.2 component list and power transformer spec||PTSOUNDLAB||Digital Source||2||13th May 2003 06:55 AM|
|New To Site?||Need Help?|