Posts: 825
Threads: 113
Joined: Aug 2012
City: The Villages
State, Province, Country: Florida
I'm working on a 48-482 and I've run into a problem. The only schematic I have been able to find shows a 6SQ7 as the first audio even though all sets have a 7B6 in its place. I have a tube diagram for the 7B6 but it would sure be a help if I had a schematic that shows the 7B6.
Does anyone know where I can get one?
Thanks,
Eric
BTW. The problem is: squeal like feedback when turning up the treble control and with a long wire antenna I can only get one local station all over the dial. Has been re-caped. Tubes and resistors replaced as nec.
Eric
The Villages, FL
Member: Philco Phorum, ARF, ARCI & Radiomuseum.org
(This post was last modified: 12-10-2012, 07:05 PM by Eric Adams.)
Posts: 2,128
Threads: 18
Joined: Oct 2008
City: Merrick, Long Island, NY
Schematic here
http://www.nostalgiaair.org/PagesByModel...013637.pdf
Tube data here for 6SQ7, 7B6 and anything else you wish.
http://www.nj7p.org/Common/Tube/SQL/Tube...?Type=6sq7
Both tubes do the same thing, and often whatever was available was used in production and changes were not always documented.
Posts: 825
Threads: 113
Joined: Aug 2012
City: The Villages
State, Province, Country: Florida
Thanks Codefox1, The schematic is the same as I have but the tube digrams are much clearer. Everything checks out at the 7B6. I guess it's back to the trouble shooting guide.
Eric
The Villages, FL
Member: Philco Phorum, ARF, ARCI & Radiomuseum.org
Posts: 150
Threads: 4
Joined: Oct 2005
City: Sullivan, MO
There is a factory service manual for this model on this page although it also shows the 6SQ7. It is in DJVU format so you will need a reader.
http://www.audiophool.com/Philco.html
Sean
WØKPX
(This post was last modified: 12-11-2012, 10:35 AM by Sean.)
Posts: 825
Threads: 113
Joined: Aug 2012
City: The Villages
State, Province, Country: Florida
Thanks Sean, that's the info I have now. I'm looking for something that shows the 7B6.
Eric
Eric
The Villages, FL
Member: Philco Phorum, ARF, ARCI & Radiomuseum.org
Posts: 289
Threads: 40
Joined: Oct 2011
City: Las Vegas, NV
Eric, AFAIK all the published prints show the 6SQ7, but the only difference is the pin numbers. That said, this weekend when I have some time, I'll pull a working chassis and take some voltage and resistance measurements. Maybe we can pin down the problem that way.
John
Las Vegas, NV USA
Posts: 825
Threads: 113
Joined: Aug 2012
City: The Villages
State, Province, Country: Florida
Thanks John, hope to hear from you soon.
Eric
Eric
The Villages, FL
Member: Philco Phorum, ARF, ARCI & Radiomuseum.org
Posts: 21
Threads: 3
Joined: Sep 2023
City: Eagle River
State, Province, Country: Wisconsin
6SQ7
https://www.nj7p.info/Tubes/SQL/Tube_que...?Type=6sq7
If this link above doesn't work, go directly to NJ7P's website and enter the tube your looking for
Tube Database Website:
https://www.nj7p.info/Tubes/SQL/Tube.php
Posts: 2,110
Threads: 156
Joined: Jan 2013
City: Westland, MI
The schematic in the Philco Radio Library accessed at the bottom of the Home page shows the 7B6.
https://philcoradio.com/library/index.ph...year-book/
Take care and BE HEALTHY! Gary
Thought I'd point it out, even though the thread is 11 years old!
"Don't pity the dead, pity the living, above all, those living without love."
Professor Albus Dumbledore
Gary - Westland Michigan
Posts: 13,776
Threads: 580
Joined: Sep 2005
City: Ferdinand
State, Province, Country: Indiana
EagleRiverMike,
Welcome.
I use Bill's (NJ7P) SQL tube database query all the time - it's much easier than getting out one of my tube manuals.
But I should mention this thread is 11 years old, and the OP (original poster) hasn't visited here in nearly two years (I hope he's ok).
--
Ron Ramirez
Ferdinand IN
Posts: 2,110
Threads: 156
Joined: Jan 2013
City: Westland, MI
Guess Ron and I commented simultaineously! Take care and BE HEALTHY! Gary
"Don't pity the dead, pity the living, above all, those living without love."
Professor Albus Dumbledore
Gary - Westland Michigan
Users browsing this thread: 1 Guest(s)
|
|
Recent Posts
|
|
Gloritone 27 Radio
|
| I have a model 27 that someone painted the cabinet brown. I've been trying to sell it for awhile but the cabinet paint m...Jim Dutridge — 02:30 PM |
|
Restoring Philco 96
|
| Joseph
Yeah. The situaction is complicated by me living with my family in NJ while mom is in FL.
Were it not for my ...morzh — 10:55 AM |
|
Restoring Philco 96
|
| Best of wishes for your mother. I hope she recovers well. My mother struggles with sciatic pain as well, so I am familia...jrblasde — 10:41 AM |
|
Restoring Philco 96
|
| Well, because I am away, I cannot check it. Hope mom becomes better enough for me to get back.
I think I will be here f...morzh — 10:27 AM |
|
Restoring Philco 96
|
| Nice find! I hope it completes your console.jrblasde — 08:45 AM |
|
Gloritone 27 Radio
|
| Hello john,
That, is the first time I have have seen or heard of that brand and model.
Welcome to the party !!
Sincer...radiorich — 08:08 AM |
|
370 Norman Bel Geddes trim pieces
|
| Thank you! I’ll probably use the half-round molding and tone it to match the original. Thanks for the replies!Max T — 06:34 AM |
|
Gloritone 27 Radio
|
| I'm kind of late to this thread, but Buzz1151 has a 3 part restore series on the model 27:
A little bit of extra t...Eliot Ness — 05:48 AM |
|
370 Norman Bel Geddes trim pieces
|
| You can get half-round moulding in various diameters at any home improvement store. That way the flat edge is uniform. ...GarySP — 12:03 AM |
|
42-345 Resistors
|
| Great comments.
I have a tinkering bench at my office, and that's where Little Phil is right now. I will have to comb ...proftrussell — 11:12 PM |
|
Who's Online
|
There are currently 1559 online users. [Complete List]
» 1 Member(s) | 1558 Guest(s)
|
|
|
|
 
|
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
