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

Thread Closed

37-670 No Sound
#7

(03-10-2016, 06:20 PM)dfields69 Wrote:  
(03-10-2016, 06:17 PM)dfields69 Wrote:  
(03-10-2016, 05:04 PM)Radioroslyn Wrote:  >The 200 ohm section that appears to handle the plate voltage for two 6J5 "driver" tubes is not generating a reading. Does that mean it is open/bad and what may I do to rectify the situation?

If there is no plate voltage on the 6J5 then the answer is yes. Well there is two answers. One you could replace the driver transformer. Or connect a resistor across the primary(like 70k or so ) and then connect the cap(like a '01 @630v) from the plate of the 6J5 to one of the grid connection on the transformer secondary.

Replacing the transformer is more efficient but adding the resistor and cap is much easier/cheaper.

Terry
What wattage on the 70K resistor? 1 watt or higher? And the grid connection would be the low ohm sections that go to the input grids on the 6F6's? I have never, ever fooled with one of these so pardon all of the questions. Terry, you have consistently come to my rescue here and I am very grateful! I sure wish i could return the favor somehow...thanks again!

And Radio Daze as well sells a Hammond 124 series interstage transformer. Were I to replace it, which of those would I go with?? The 124D looks close as a novice, but I am very uncertain.
I think the 124D is a good choice but I not quite sure what sort to turns ratio we need. It's at 1 to 1:5. The higher the ratio the higher the ac signal will be at the 6F6 grids. The 6F6's are triode connected (plate and screen grid are connected together) which lower the gain of the tubes. So typically it requires more driving signal.
The transformer Mike suggested I think is a single plate to P/P grids. Won't work no tap on the primary. Yours is P/P plates to P/P grids.

Terry


Messages In This Thread
37-670 No Sound - by dfields69 - 03-10-2016, 03:03 PM
RE: 37-670 No Sound - by Radioroslyn - 03-10-2016, 05:04 PM
RE: 37-670 No Sound - by dfields69 - 03-10-2016, 06:17 PM
RE: 37-670 No Sound - by dfields69 - 03-10-2016, 06:20 PM
RE: 37-670 No Sound - by Radioroslyn - 03-10-2016, 07:38 PM
RE: 37-670 No Sound - by Radioroslyn - 03-10-2016, 07:21 PM
RE: 37-670 No Sound - by morzh - 03-10-2016, 07:19 PM
RE: 37-670 No Sound - by morzh - 03-10-2016, 08:02 PM
RE: 37-670 No Sound - by dfields69 - 03-10-2016, 08:24 PM
RE: 37-670 No Sound - by Radioroslyn - 03-11-2016, 12:38 AM
RE: 37-670 No Sound - by dfields69 - 03-11-2016, 02:19 AM
RE: 37-670 No Sound - by Mondial - 03-11-2016, 09:42 AM
RE: 37-670 No Sound - by dfields69 - 03-11-2016, 12:59 PM
RE: 37-670 No Sound - by Mondial - 03-11-2016, 03:37 PM
RE: 37-670 No Sound - by dfields69 - 03-12-2016, 02:16 AM
RE: 37-670 No Sound - by dfields69 - 03-12-2016, 02:17 AM
RE: 37-670 No Sound - by Mondial - 03-12-2016, 09:53 AM
RE: 37-670 No Sound - by dfields69 - 03-23-2016, 05:10 PM
RE: 37-670 No Sound - by morzh - 03-23-2016, 07:06 PM
RE: 37-670 No Sound - by Radioroslyn - 03-23-2016, 07:30 PM
RE: 37-670 No Sound - by davemc - 03-24-2016, 08:07 AM
RE: 37-670 No Sound - by Ron Ramirez - 03-31-2016, 09:58 PM
RE: 37-670 No Sound - by dfields69 - 03-31-2016, 11:37 PM
37-670 Continued Woes - by dfields69 - 03-31-2016, 09:47 PM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
under chassis parts locator diagram for 1938 Zenith 9s262
Has anyone gone to the trouble of creating an under chassis parts locator image?  Yes, I can identify components by foll...bobloney — 08:57 PM
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

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

>