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

Thread Closed

Philco 20 restoration state: need the voltage chart
#4

1. All 5 wire-wound resistors, 50K, 100K, 250K, 500K have run away to the values that are anywhere 30-100% up.
Wow. Granted, I have no experience with these that are 80 years old but the resistors I did not expect to behave like so.

Need to buy those.


2. Also, the tapped resistor last section (1-2) of 1.4K that ties the 71A filament's Power Xfmr winding center-tap to all other Xfmr centertaps was just opened.
I even think I know why - the output stage probably smoked, as the output audio Xfmr primary, one half, was fried, and so was one of the tubes. There was something catastrophic, so the current probably burned that 1.5Kohm section.

Once I put an external 1.4K resistor there, the speaker came alive, and I clearly hear a reasonably loud scratch when I rotate the volume (the antenna attenuator) var. resistor.

I wonder what else's in stock for me, but I will start with resistors.

I want to buy "authentic" parts, so what do you tfhink of "Philcorepairbench.com"?

People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.


Messages In This Thread
Re: Philco 20 restoration state: need the voltage chart - by morzh - 10-26-2011, 08:32 PM



Users browsing this thread: 2 Guest(s)
[-]
Recent Posts
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
54C Complete Teardown/Rebuild
Richard, The Silvertone 2014 also is a transformerless set, so I am incorporating a 1:1 600 ohm audio isolation transfo...glyphmon — 11:37 PM
Preliminary work on wife's Silvertone 2014
Did an alignment today which was interesting.  IF alignment went great, almost all was already spot-on.  Adjusting on th...glyphmon — 11:35 PM

[-]
Who's Online
There are currently 1667 online users. [Complete List]
» 1 Member(s) | 1666 Guest(s)
Avatar

>