Welcome Guest! Be sure you know and follow the Phorum Rules before posting. Thank you and Enjoy! (January 12) x

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

HiFi (Chifi) tube amp build - but my own design.
#54

Hey all! I've been pretty quiet on this one because I'd been having some "mystery" problems, which really left me scratching my head. Amp 2 would work great, then it wouldn't, then it would, then it wouldn't. I've been testing different tube types, taking measurements, trying different voltages, having problems with red plating on different tubes, oscillations, then even having problems with sometimes one of the tubes not lighting up! I finally found the cuplrit(s). The octal tube sockets are junk! Usually if a socket is bad, you can move the tube around and get it to work or not work. Not in this case. I did have an occasional static in amp 1 and could move one of the tubes (same sockets) and get it to kinda quit. Figured it was a cold solder or something. It really came to a head when I stuck a "nice" set of 6V6's in there, and couldn't get things to sound right. Bass was weird, mids were scratchy - then they weren't, oscillations, low power ... things I wrote off as bad/weak tubes! Then I noted that only 1 6V6 was that nice pretty blue when I turned off the lights ... voltages checked fine. Well - ya get the point! This was a tough one! And now, almost all my tests and tweaks - trash can! I suspect it was losing G2 voltage. How would you even test for something like this? Maybe a socket adapter? Even pulling the tube partially out might affect things. So anyways, learn from my mistake.

AVOID these sockets! Save yourself some misery. These came from the auction site. I'm not bashing any particular seller either, but these "bakelite" sockets are JUNK! I suggest some ceramic sockets.
   
   
   

If I could find the place called "Somewhere", I could find "Anything" Icon_confused

Tim

Jesus cried out and said, "Whoever believes in me , believes not in me but in him who sent me" John 12:44


Messages In This Thread
462ron - by 462ron - 10-15-2024, 09:07 AM
RE: HiFi (Chifi) tube amp build - but my own design. - by TV MAN - 01-13-2025, 12:29 PM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
HiFi (Chifi) tube amp build - but my own design.
Tim, I have some bakelite sockets in my work shop that I can dig up. I believe quite a few are NOS. I will take photo...RodB — 10:03 PM
Philco 610B oscillator wiring
> The cathode as noted is wired directly to the ground side of the heater filament for that tube, not to the #17 and ...Radioroslyn — 08:12 PM
HiFi (Chifi) tube amp build - but my own design.
Tim; I noticed your post a little late, but I would take one of the junk sockets and try to break a chunk out of it wi...Arran — 08:07 PM
Need to purchase some accessories for restoration of my Old Philco Radio
Here is a list of resources found in our online library that you might find useful. Mike's Gobs of Knobs email addres...klondike98 — 01:46 PM
First Radio restoration
Hi Tubeman, Welcome to the Philco Phorum.  Phamily Phriendly Pfun with Phine Pholks Phull of Philco Phacts. (See a p...MrFixr55 — 12:33 PM
First Radio restoration
You could post in the WANTED ADs section here on the Phorum and see if anyone has an RF generator that they want to sell...klondike98 — 11:55 AM
Zenith H725
Good ideas, thank you Arrange and Rich. I have the adhesive aluminum foil already and can try that immediately. More ...EdHolland — 10:18 AM
Graphics for majestic 1050 dial glass.
Murf; I found this thread on the ARF, the first photo has a pretty good view of the dial glass. Regards ArranArran — 01:12 AM
Zenith H725
hello Ed, how about that speacial tape used for ducting it's like foil or how about thin piece of aluminum roof flash...radiorich — 12:19 AM
Zenith H725
Ed; One material that I have seen, but never tried for this was material for making exhaust gaskets, it's similar to ...Arran — 11:42 PM

[-]
Who's Online
There are currently 1663 online users. [Complete List]
» 1 Member(s) | 1662 Guest(s)
Avatar

>