1. The PHILCO Phorum
  2. Various and Sundry Categories
  3. Other Radios (Non-Philco)

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

Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5

Threaded Mode
Coronado 962A
RodB
Phorum Expert
*****
Posts: 1,190
Threads: 46
Joined: Feb 2015
City: Roseville, MN
#1

07-17-2024, 11:25 AM
I'm looking at replacing an output transformer for this farm radio. It has 2 1Q5s in parallel driving a SE OPT. The 1Q5 has a suggested plate load of 8k. If the tubes are in parallel then can I be okay using an OPT with a 4K primary impedance?
(This post was last modified: 07-17-2024, 12:44 PM by RodB.)
Find
Arran
Phorum Expert
*****
Posts: 4,945
Threads: 54
Joined: Sep 2008
City: Sandwick, BC, CA
#2

07-17-2024, 05:10 PM
Just out of curiosity is there an economy switch that shuts off one of the 1Q5 tubes to save on battery life? I couldn't find a 962A on N.A only a 962 so I assume it's similar. I think you would be right about the plate load impedance being 4000 Ohms, but I'm sure someone else will chime in.
Regards
Arran
Find
RodB
Phorum Expert
*****
Posts: 1,190
Threads: 46
Joined: Feb 2015
City: Roseville, MN
#3

07-17-2024, 05:20 PM
There doesn't seem to be a switch to turn off one of the 1Q5s. The schematic at NA is the correct one. The A suffix is for speaker size as noted in the schematic.
Find
« Next Oldest | Next Newest »




Users browsing this thread:
[-]
Recent Posts
Philco 42-345 Restoration/Repair
The thrill is gone again, thought I was close to being done with it. Well Friday it was receiving broadcast, Saturday mo...osanders0311 — 07:47 PM
Help with Supreme 599
Iam getting closer to fixing it. I bumped Up the tranny voltage to get 5v on the 80 tube. I gan get the needle to move ...daveone23 — 03:41 PM
Philco 42-345 Restoration/Repair
Hello RodB, Checking my previous post I realized you're the one with the 42-340. I replaced the string for the tuning...osanders0311 — 03:12 PM
5U4 vs 5Z4 tubes
I saw no evidence of anything going wrong. The transformer is fused already which is nice. Interestingly the 5z4 did...bridkarl — 02:37 PM
5U4 vs 5Z4 tubes
I doubt anything cooked in 30 seconds because of the oops! These are very similar tubes, and nothing but transformer re...GarySP — 02:30 PM
Restoration of the Canadian General Electric A-87
Paul Philco322.You will be keeping very busy, you may have to go back to work for a breakIcon_smile. Paul To rel...RadioSvit — 01:57 PM
5U4 vs 5Z4 tubes
I grabbed the wrong tube and put in a 5U4 tube instead of the 5Z4 - I just had the rectifier in with no other tubes. Af...bridkarl — 01:54 PM
Restoration of the Canadian General Electric A-87
After applying the filler to the entire body, I noticed that the shades of the facade and the side and top walls were ve...RadioSvit — 01:49 PM
Restoration of the Canadian General Electric A-87
You will be keeping very busy, you may have to go back to work for a break:). PaulPaul Philco322 — 01:46 PM
Restoration of the Canadian General Electric A-87
After removing the control knobs, chassis, dynamics and scale frame, I first started restoring the torn piece of veneer....RadioSvit — 01:20 PM

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

>
  1. The PHILCO Phorum
  2. Various and Sundry Categories
  3. Other Radios (Non-Philco)