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

Push Pull tube amp kit from China
#17

Progress from last night:

After attaching the PCB (hopefully for the last time), I pushed the tube sockets tight against the chassis, double checked to make sure all pins were in their place, then soldered. I soldered 2x just to make sure it was a good connection. I got the output transformer wires soldered on. I found lightly & carefully tinning the stranded wire helped it go in.

   

A comparison of the supplied electrolytics vs. the CDE.
   

They were a lot bigger and fit was tight, but they are in.
   

One mistake I made with my last build was not grounding one side of the filament winding. It produced an annoying hum among other things. It's NOT on the schematic, but this shows where I connected the ground for the output tubes. The voltage amp tubes have the filament center tap grounded. The current rating is the same for both filament windings, so I connected it like what appeared in the picture of the completed amp build shown on the auction site. One additional thing I did was to add a ground from the - on the PCB to connect to the ground on the terminal strip, just to insure if there's any resistance on the chassis it has a direct path to the B-
   

I did a no tube/no load partial power up and things look good so far. I did a few resistance checks 1st from the B+ to ground and didn't see anything unusual. I only powered up to about 60v and voltages looked about right.

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
Push Pull tube amp kit from China - by TV MAN - 02-03-2022, 10:03 PM
RE: Push Pull tube amp kit from China - by TV MAN - 02-03-2022, 10:18 PM
RE: Push Pull tube amp kit from China - by TV MAN - 02-05-2022, 12:13 PM
RE: Push Pull tube amp kit from China - by morzh - 02-05-2022, 05:27 PM
RE: Push Pull tube amp kit from China - by TV MAN - 02-07-2022, 03:20 PM
RE: Push Pull tube amp kit from China - by morzh - 02-13-2022, 08:23 PM
RE: Push Pull tube amp kit from China - by TV MAN - 03-02-2022, 01:04 PM
RE: Push Pull tube amp kit from China - by morzh - 03-04-2022, 08:34 PM
RE: Push Pull tube amp kit from China - by TV MAN - 03-09-2022, 10:21 AM
RE: Push Pull tube amp kit from China - by TV MAN - 03-10-2022, 12:40 PM
RE: Push Pull tube amp kit from China - by TV MAN - 03-11-2022, 02:18 PM
RE: Push Pull tube amp kit from China - by TV MAN - 03-11-2022, 03:24 PM
RE: Push Pull tube amp kit from China - by TV MAN - 03-13-2022, 11:31 PM
RE: Push Pull tube amp kit from China - by TV MAN - 03-14-2022, 01:53 PM
RE: Push Pull tube amp kit from China - by TV MAN - 03-22-2022, 08:55 AM
RE: Push Pull tube amp kit from China - by TV MAN - 03-22-2022, 11:25 PM
RE: Push Pull tube amp kit from China - by TV MAN - 03-23-2022, 11:35 PM
RE: Push Pull tube amp kit from China - by TV MAN - 01-08-2025, 04:29 PM
RE: Push Pull tube amp kit from China - by morzh - 01-08-2025, 06:36 PM
RE: Push Pull tube amp kit from China - by TV MAN - 01-08-2025, 07:56 PM
RE: Push Pull tube amp kit from China - by TV MAN - 01-09-2025, 03:27 PM



Users browsing this thread: 3 Guest(s)
[-]
Recent Posts
B&K 1077B no video
Hello Tim, I would if it's a leaky Capacitor So are all 3 of those B- voltages low then ? Sincerely Richardradiorich — 01:55 AM
B&K 1077B no video
I found a schematic and think I have the problem traced down to the minus power supply. I have very low voltages that go...TV MAN — 12:41 AM
RCA 15X
I'd try replacing the bulb first and if that doesn't do it, then change the 35Z5 and see if the problem goes away.NostalgiaRadioTime — 12:28 AM
B&K 1077B no video
Hello Tim, I have that exact unit in my shop too plus a Sencore unit there are times I like one or other !!. Sincerely...radiorich — 11:07 PM
RCA 15X
Everthing goes at once, maybe it's the cold weather, I have had 2 dial strings break and no my little RCA is having dial...Paul Philco322 — 10:26 PM
Philco 91 Schematic
Hi Dan, I can't explain this specific resistor but I have seen the use of a switch to apply B+ voltage to screen gri...RodB — 09:36 PM
6TPZ and 5TPO Radio Help
I suspect it's been repaired before. And I suspect whoever repaired it, wanted to re-use old transistors' pin stubs in o...morzh — 09:24 PM
B&K 1077B no video
Thanks Rich! I'll take a look and see what he has. I know there's more modern equipment to be had, but this one I know a...TV MAN — 09:11 PM
B&K 1077B no video
Hello Tim, Here is a link to restoration of one on Phil's old radios site ! Sincerely Richard bk1077bradiorich — 09:01 PM
6TPZ and 5TPO Radio Help
I'm a little befuddled on this one. Should X5 and X4 be tied together like this?  It looks like someone added this at so...R3Sons — 07:33 PM

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

>