Adding AVC Mod to Philco 70
Posts: 13,776
Threads: 580
Joined: Sep 2005
City: Ferdinand
State, Province, Country: Indiana
Great progress was made on this project today.
The only work left to do is to add the 1N34A diode, restuff the twin AC line bypass bakelite block, add a power cord and a set of tubes - and this chassis will be ready to try out!
An under-chassis picture:
[Image: https://philcoradio.com/images/phorum/70mod/70_024.jpg]
and the schematic with yellow highlights indicating what has been completed:
[Image: https://philcoradio.com/images/phorum/70mod/70_025.jpg]
It's getting close...more to come tomorrow, so stay tuned.
--
Ron Ramirez
Ferdinand IN
Messages In This Thread
RE: Adding AVC Mod to Philco 70 - by Ron Ramirez - 06-15-2019, 10:34 PM
Users browsing this thread: 1 Guest(s)
|
|
Recent Posts
|
|
Philco 42-345 Restoration/Repair
|
| Ok MrFixr55,
I have tried the DeoxIT D5 on the band switch and even though it has relieved the tension I felt when turn...osanders0311 — 11:11 AM |
|
Part numbers to model cross
|
| Is there a reference somewhere where you can punch in Philco part numbers and see what models those parts were used in?Jim Dutridge — 10:17 AM |
|
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 |
|
Who's Online
|
There are currently 1543 online users. [Complete List]
» 1 Member(s) | 1542 Guest(s)
|
|
|
|
 
|
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
