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

Thread Closed

Philco 89 (123) (Update-Coil rewind)
#5

I forgot to mention: A properly restored, stock 89 can work just about as well as one does with the "Super 89" mod - IF you take the time to bake the oscillator coil in your oven for about 30 minutes at 200 degrees F, then clean off and rewind the outer (tickler) winding. This is critical. These oscillator coils are very prone to moisture absorption. Also, be sure you replace the 15K resistor in series with the oscillator coil tickler winding - part (10) in Bulletin 146 - with a 10K or even 8.2K unit; 1/2 watt is fine. In addition, you must replace the capacitor in parallel with this resistor, part (8) in Bulletin 146, with a new 680 pF mica or NP0 ceramic cap. The original was 700 pF and is a paper-wound cap inside a bakelite block shared with a .09 uF cap connected as a B+ bypass. 680 pF works fine as a replacement for the 700 pF cap. This will cure most, if not all, of the ills associated with Model 89.

--
Ron Ramirez
Ferdinand IN


Messages In This Thread



Users browsing this thread: 2 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.

>