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
Philco 50-925 antenna connections
Most loop antenna setups are either one continuous loop with two connections or 2 loops with 4 connections. The latter c...RodB — 02:16 PM
Value of capacitor
Not trying to answer for the OP, just commenting on the thread. According to AI... ...assuming the electrolytic that'...HowardWoodard — 02:09 PM
Philco 50-925 antenna connections
Hello Keith! I've updated your thread with the proper model number. Take care, - GaryGarySP — 01:10 PM
Value of capacitor
Why are you having to replace it? Does it measure out of tolerance? Is it mechanically damaged?DaleHCook — 07:50 AM
462ron
Hi Keith, here is the official Philco service info found in the Philco Library under service info……https://philcoradio.c...462ron — 07:23 AM
My collection presentation
This article has been completely updated and finished. The beginning of a portable collection.Vlad95 — 11:49 PM
Philco 50-295 antenna connections
Thanks Rod, That makes perfect sense. Is there a way to edit my post? It's a Philco 50-925 and not a Philco 50-295. D...keith49vj3 — 09:55 PM
Philco 50-295 antenna connections
C is for an external speaker.RodB — 08:39 PM
Philco 370LZ chair side not a 71LZ
Can you send a couple of pictures?slford310 — 07:11 PM
Philco 370LZ chair side not a 71LZ
Thank you for the reply. After much studying I figured it just sat there and you have to open the top and pull up and/o...Villager61 — 06:42 PM

[-]
Who's Online
There are currently 1065 online users. [Complete List]
» 1 Member(s) | 1064 Guest(s)
Avatar

>