Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5

Building a Tube Type Power Supply
#8

So far, after wiring up two 12AX7 tubes as line, driver & phase inverter and using two 6V6GT tubes running at 32mA each the transformer does not even get warm. However 32mA is high for 6V6GT tubes, so I increased the cathode resistor for the push-pull 6V6 pair to 390 ohms and dropped the current per tube to 26.5mA where the whole arrangement runs quite cool. B+ is running about +330V at the first electrolytic cap and +325 at the second electrolytic cap which is after the choke.

Power transformer is quite cool to the touch even after an hour or so of operation.

Joe


Messages In This Thread
Building a Tube Type Power Supply - by Joeztech - 03-09-2015, 11:13 AM
RE: Building a Tube Type Power Supply - by Arran - 03-10-2015, 12:42 AM
RE: Building a Tube Type Power Supply - by Joeztech - 04-18-2015, 01:41 PM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
Correct model 84 Ac plug an cord type
From what I read Philco went to using brown rubber power cords in 1936, so cloth was used in the 1935 and earlier models...Arran — 11:25 PM
Correct model 84 Ac plug an cord type
Hi Bruce, I have not worked on an 84, but in general, power cords for almost any radio prior to 1938 was cloth covered...MrFixr55 — 08:34 PM
Restoring Philco 38-14
OK, well, so after staring at the sch again, I realized the problem had to be the #12/12A padder. I put a scope on the o...morzh — 08:15 PM
Correct model 84 Ac plug an cord type
Hello Bruce, I mostly use brown far as my cloth powercords go ! Here is the plug that I have used bakelite Acorn style...radiorich — 08:05 PM
Correct model 84 Ac plug an cord type
Looking for as correct as can find the right Ac plug an the correct colored cloth line. Ive seen many old photos but mos...Bruce — 04:13 PM
Restoring Philco 38-14
Rod Two Y-caps make sense if you use them from L/N to the chassis; this is only makes sense in the transformer radios...morzh — 10:11 AM
Restoring Philco 38-14
Mike, I'm curious about a specific use of he Y cap. Lately I've seen a single cap across the power transformer primary. ...RodB — 09:01 AM
Restoring Philco 38-14
hello morzh , That sounds like a plan ! Sincerely Richardradiorich — 07:45 AM
Restoring Philco 38-14
Richard, It helped some, but I still had the whining when engaging the rear power strip (I did not realize it was fro...morzh — 07:07 AM
Restoring Philco 38-14
Hello morzh, Yes , that dreaded hum in my room where i do alighment I have my cable modem and router plus desktop plus ...radiorich — 11:25 PM

[-]
Who's Online
There are currently no members online.

>