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

Thread Closed
Thread Rating:
  • 2 Vote(s) - 4.5 Average
  • 1
  • 2
  • 3
  • 4
  • 5

TrueTone Model D-2026 series B Manual
#12

Since David was kind enough to post the proper schematic, was hoping I could move over to my next question on this thread.
While waiting for an audio output transformer to arrive, started making checks on the power transformer. Found the center tapped 
secondary to the plates of the rectifier open. No resistance across the the winding or from center tap to either side of the winding.
I've found a transformer made by Hammond the 270BX. Secondary outputs of 6.3 v 2A, 5v 2A. question is I'm not sure how to interpret 
the data for the center tapped winding. It's listed as 550 VCT 57.5mA. Does 550 VCT mean 550 V across the coil if the center tap is unused.
Or does it mean 550 volts on either side of the center tap connected to B-. Plus not sure if the amperage ratings are correct either.

Or do I have different options altogether I'm not aware of.

Thanks

Tim


Messages In This Thread
TrueTone Model D-2026 series B Manual - by TTech - 10-04-2020, 12:34 PM
RE: TrueTone Model D-2026 series B Manual - by TTech - 10-06-2020, 10:44 AM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
Philco 42-345 Restoration/Repair
Hi OSanders, Look carefully at the band switch. Turn it slowly and "wiggle" it around the desired band. ...MrFixr55 — 12:33 AM
5U4 vs 5Z4 tubes
I think that RCA and GE introduced metal tubes in the USA in 1936.  I don't know if they were being made by RCA, GE or b...MrFixr55 — 11:20 PM
Philco 42-345 Restoration/Repair
Vlad95, Thank you for the stringing guides and wow there are so manyosanders0311 — 06:01 PM
5U4 vs 5Z4 tubes
A pre war Hallicrafters, and an early one too, very nice! 1936 is pretty early for metal tubes too, which would explain ...Arran — 05:58 PM
Philco 42-345 Restoration/Repair
Thanks Rod, "When you hear the background hiss and no station it usually indicates that the oscillator quit" ...osanders0311 — 05:52 PM
Philco 42-345 Restoration/Repair
RodB :beerchug:Vlad95 — 10:22 AM
Philco 42-345 Restoration/Repair
Vlad, you nailed it. Swiss and German roots.RodB — 09:54 AM
5U4 vs 5Z4 tubes
Well this is a Hallicrafters SX/9 circa 1936. No real issues so far although I dodged a real bullet with a cap that was...bridkarl — 07:59 AM
5U4 vs 5Z4 tubes
The pinout is the same but the 5U4 has a 3 amp filament, verses 2 amps or less on the 5Z4. I think that the pinout of a ...Arran — 12:04 AM
Philco 42-345 Restoration/Repair
By the way. osanders0311 Take a look here: Dial cord stringing Guides May be here you can fount correct string settin...Vlad95 — 11:15 PM

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

>