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

Hickok 288x
#15

I wouldn't worry about any of the secondaries wired to chassis ground, I am concerned about the primary of the power transformer becoming grounded. The very nature of the EMI suppression caps will cause leakage. I dunno if enough to cause a spark.

Re the loss of voltage at C31, which end of R22? The end going to load or the end going to the 6X5 cathode?

Something is loading the heck out of the power supply. Try this:

Pull ALL of the tubes except the6X5 and remeasure the power supply at both ends of R22. The readings should be quite even.

Power down, reinstall each tube one at a time until the problem reappears.
Replace the tube that loaded the PS down with a new one. If the issue recurs, remove a different tube and retest to see if the issue is a specific stage bad or total load being an issue. Check for something loading a screen or plate to ground.

"Do Justly, love Mercy and walk humbly with your God"- Micah 6:8
Best Regards, 

MrFixr55


Messages In This Thread
Hickok 288x - by daveone23 - 10-14-2024, 03:27 PM
RE: Hickok 288x - by MrFixr55 - 10-14-2024, 04:50 PM
RE: Hickok 288x - by daveone23 - 10-14-2024, 05:40 PM
RE: Hickok 288x - by daveone23 - 10-14-2024, 07:27 PM
RE: Hickok 288x - by MrFixr55 - 10-14-2024, 07:43 PM
RE: Hickok 288x - by MrFixr55 - 10-14-2024, 08:04 PM
RE: Hickok 288x - by radiorich - 10-14-2024, 10:24 PM
RE: Hickok 288x - by daveone23 - 10-15-2024, 08:05 AM
462ron - by 462ron - 10-15-2024, 08:37 AM
RE: Hickok 288x - by daveone23 - 10-15-2024, 10:01 AM
RE: Hickok 288x - by daveone23 - 10-15-2024, 03:50 PM
RE: Hickok 288x - by daveone23 - 10-15-2024, 04:36 PM
462ron - by 462ron - 10-16-2024, 07:43 AM
RE: Hickok 288x - by daveone23 - 10-16-2024, 04:33 PM
RE: Hickok 288x - by MrFixr55 - 10-16-2024, 09:57 PM
RE: Hickok 288x - by daveone23 - 10-17-2024, 07:23 AM
RE: Hickok 288x - by daveone23 - 10-22-2024, 04:59 PM
RE: Hickok 288x - by MrFixr55 - 10-22-2024, 08:10 PM
RE: Hickok 288x - by daveone23 - 10-23-2024, 08:44 AM
RE: Hickok 288x - by daveone23 - 10-23-2024, 06:54 PM



Users browsing this thread: 2 Guest(s)
[-]
Recent Posts
Model 28L
For 28 you will probably need to buy a Hammond 125CSE. Or any of the series of the power you need, with SE suffix. Then ...morzh — 02:09 PM
37-60 revision 6
I am restoring a Philco 37-60 and it shows run 6 they removed the ground from G3 of the 6K7G and put the G3 to -2.5v for...bobbyd1200 — 01:01 PM
Shadow Meter Bulb
Mike is correct on the bulb connection, two separate circuits. I found that by rotating the bulb and sliding it forward ...RodB — 12:19 PM
Hickok AC51 tube tester
Cleaned ann contacts, switches and sockets, works great now.martinj — 11:32 AM
Model 28L
Hello, I'm restoring a Philco 28L and the output transformer is open. Part number of the transformer is 32-7020. Can...HORSTE — 10:32 AM
Philco 42-1008 conversion kit
I read about a kit to convert the variable speed changer in the Philco 42-1008 into a single speed unit.  That would rem...alangard — 09:30 PM
HiFi (Chifi) tube amp build - but my own design.
Tim Well...a chassis is metal. Magnetic or not, it does not matter. A transformer has some hum to it. It is natural. Th...morzh — 08:40 PM
Hickok AC51 tube tester
I thought the 83 tube was bad because it looked white but it tests strong. Blue gassy though. I checked the fuse, it was...martinj — 08:37 PM
Shadow Meter Bulb
Ross I am not sure what current limiting effect the incandescent provides. They are two different parts of the sch...morzh — 08:31 PM
12' Philco
Bob Thanks for that photo. I have been looking for it, and I cannot find anythinmg on the web. I forgot it was here...morzh — 08:29 PM

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

>