Posts: 1,824
Threads: 114
Joined: Jul 2014
City: Sneedville, TN
Yes, the 71A tubes are getting expensive. The cheapest I can find them on eBay is $18 plus shipping for good tested tubes. I advise you to check the filament voltage at the socket before you plug anything into it. The 71A has a 5 volt filament, so the voltage between the two fat pins should not be much above that. It can be AC or DC according to the spec sheet.
[Image: https://64.media.tumblr.com/aede1094fb9b...2e5b49.jpg]
You can also check the DC voltage from the plate to the filament, then check the grid bias voltage, and compare them to those shown on the spec sheet to see if they are in the ball park. Beyond that, about all you can do is hope for the best. Good luck.
Messages In This Thread
RE: Philco Model 86 - by mikethedruid - 12-01-2021, 01:47 PM
Users browsing this thread: 2 Guest(s)
|
|
Recent Posts
|
|
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 |
|
54C Complete Teardown/Rebuild
|
| The main problem with adding a Bluetooth input is that this set lacks a traditional power transformer to isolate it from...radiorich — 11:19 PM |
|
54C Cabinet Refinish
|
|
I started stripping this cabinet before it got super chilly out because I knew I wasn't going to be able to work on ...glyphmon — 11:18 PM |
|
54C Complete Teardown/Rebuild
|
| While I'm waiting to wrap up the final steps on my wife's Silvertone 2014, I started disassembly on the next project. O...glyphmon — 11:07 PM |
|
Preliminary work on wife's Silvertone 2014
|
| Hello roy,
that great news glad it worked out for you !!
Sincerely Richardradiorich — 10:50 PM |
|
Preliminary work on wife's Silvertone 2014
|
| Safety caps arrived today. Soldered one in and had a successful first power-up. No magic smoke escaped and it tunes in...glyphmon — 09:53 PM |
|
Who's Online
|
| There are currently no members online. |
|
 
|
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
