Welcome Guest! Be sure you know and follow the Phorum Rules before posting. Thank you and Enjoy! (January 12, 2025) x


HiFi (Chifi) tube amp build - but my own design.
#67

Well, found muh culprit. After using socket test adapters and finding voltages all ok, swapping 6V6s, no avail, swapped the 6GH8a with a good Phillips 6U8a and bingo! Clean as can be! Junk Jap made 6GH8 tubes! Well, I kinda think they may all be junk. Anyway, the couplers are fine. It hadn't been sounding very good and with one output tube having to be flipped or moved to get it to light up, figured the sockets were the main problem. Wrong! Stupid tube failed! Same with the china made ones. Don't last. That said, I'd observed some weird effects putting my meter/oscilloscope probes on the lower 6V6 G1 (cathode side of the phaser), so I swapped in a 10k stopper (left the 1K on the other tube) and that stopped the weird effects/oscillations. Read that needed to be done on some circuits using the 6U8/6GH8 driver instead of 7199 in AK. Well, must be something to that since it seemed necessary in this adaptation. I can elaborate if anyone would like the reason for this.

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 - 06-07-2025, 11:18 PM



Users browsing this thread: 2 Guest(s)
[-]
Recent Posts
Plug Voltages Needed For A 1943 CRV-20130 Power Supply
Try looking at this site the book mark is for a old generator that I was given. David    https://radionerds.com/index.ph...David — 08:36 PM
Plug Voltages Needed For A 1943 CRV-20130 Power Supply
Hello Everyone, I am looking for voltage identification for all the pin positions on the socket of a CRV-20130 power su...Tonym4704 — 08:16 PM
Philco P45-6365 Universal Transformer Instruction Manual
Can anyone guide me to where this may be found?GRG — 03:00 PM
54C Complete Teardown/Rebuild
I don't think that I have encountered a 12Z3 before, curious how it uses one of those but includes a #43, which is a 25 ...Arran — 02:17 PM
HiFi (Chifi) tube amp build - but my own design.
It's the other forum. I'm also in DIY, but mostly read there. Honestly, I kinda jumped into this without much thought to...TV MAN — 10:43 AM
Philco 71 Code 125
Hello,  I am in need of a schematic for this radio. Mine has the three separate circular tube shields and a shadow me...dconant — 08:06 AM
Stromberg Carlson 1500 Squeal
And life just keeps getting more complicated.dconant — 07:57 AM
54C Complete Teardown/Rebuild
Hello Roy, here is this one sincerely Richardradiorich — 12:45 AM
54C Complete Teardown/Rebuild
Richard, Had grabbed it already but thank you just the same.  I find myself wanting to find some way to block out the...glyphmon — 12:03 AM
54C Complete Teardown/Rebuild
Hello roy, here is a link to the schematic . Sincerely Richardradiorich — 11:54 PM

[-]
Who's Online
There are currently 2096 online users. [Complete List]
» 4 Member(s) | 2092 Guest(s)
AvatarAvatarAvatarAvatar

>