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

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

Model 80 Mods
#1

Making progress on my model 80. It is playing well and the voltages seem more in line now that I can check them with a VTVM. At a later date I think I will need an alignment to peak performance. I receive stations all along the dial range. However there is one station on the 150 dial location that is very strong, but very distorted.

Following Ron's mods: I have changed resistor #9 to a 13k 3 watt. Changed resistor #16 to a 2meg. Now I'm getting ready to change the connection of resistor #5 and cap#6 with respect to their connection to the antenna coil. Which brings up the question of the "gimmick". In the performance modifications on his website there is one wire with three turns wrapped around the volume control wiper lead and then connected to the cathode of the detector-oscillator tube. Simple enough, but then I found an earlier post on the subject where there were two wires. One connected to the cathode of the detector-oscillator tube the other wire connected to the volume control center tap with the free ends overlapping about an inch and twisted together. Which is correct? Then It dawned on me I have a model 84 sitting here as a next project. Different still. That gimmick wire is indeed wrapped around the volume control wiper lead, but then is connected to the oscillator-transformer. Photo below is my model 84 with the solder tool pointing to the connection.

While the radio is playing there is a definite boost in volume if I touch my finger to the shaft of the volume control. Is this what the gimmick is intended to do?


Attached Files Image(s)
   


Messages In This Thread
Model 80 Mods - by Mike L - 10-03-2016, 06:45 PM
RE: Model 80 Mods - by Radioroslyn - 10-03-2016, 07:15 PM
RE: Model 80 Mods - by Mike L - 10-08-2016, 01:25 PM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
Graphics for majestic 1050 dial glass.
Murf; I found this thread on the ARF, the first photo has a pretty good view of the dial glass. Regards ArranArran — 01:12 AM
Zenith H725
hello Ed, how about that speacial tape used for ducting it's like foil or how about thin piece of aluminum roof flash...radiorich — 12:19 AM
Zenith H725
Ed; One material that I have seen, but never tried for this was material for making exhaust gaskets, it's similar to ...Arran — 11:42 PM
Zenith H725
I just remembered, I have some hi temp silicone rubber material which could do the trick. Or a piece of FR4 laminate. Th...EdHolland — 08:39 PM
Zenith H725
The PSU filter cap arrived today (thank you USPS!) so I will work on that later. Meanwhile, I have the dial, speaker...EdHolland — 06:42 PM
Philco 610B oscillator wiring
Thanks Terry. After checking my notes I think I recorded about -10v at the 6A7 G4/control grid. The screen grid (G3 &...Tubester — 05:59 PM
The list of my radio & TV collection!
Magical chords of forgotten melodies, old nostalgic music on an old radio... Saturday night blues on the Mid-Waves on an...RadioSvit — 12:20 PM
Philco 42-345 Restoration/Repair
Thank you MrFixr55 the issue with this radio is that the internal coil antenna is missing and there was a wire in its pl...osanders0311 — 11:34 AM
Philco 610B oscillator wiring
Regarding the oscillator circuit which is comprised of the 6A7's cathode, control grid, and screen grid. These elements ...Radioroslyn — 10:33 AM
Philco 42-345 Restoration/Repair
Hi OSanders, First off, welcome to the Philco Phorum where Phine Phamily-Phriendly Pholks Phull of Philco Phacts and P...MrFixr55 — 08:41 AM

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

>