Posts: 4
Threads: 1
Joined: Jan 2016
City: Jackson NJ USA
Hi All,
New member- first time poster.
I have a model 81 that I have rebuilt. Replaced all caps, resistors and rewound the ant coil (primary side).
The speaker cone is in bad shape but it plays.
The set is working and I can get a local station in my basement- so I am not too far from finished.
I have been making voltage measurements on the tubes to confirm everything is in spec and I am having a problem reconciling the 42 output tube with the rider voltage chart for this radio. Specifically, the control grid CG to cathode K. The rider manual calls for 2.3 V. The 42 tube data sheet calls for a control grid voltage of -16.5 to -20 v. I am measuring about -17 v from CG to K (ground). Not sure if I have a problem or not.
My plate, screen and filament voltages are in spec. (riders chart).
thanks for the help,
Anthony
Posts: 670
Threads: 11
Joined: Sep 2014
City: Bellmawr, NJ
I say ,,,you are in the range between -16.5 to -20,,,sounds good to me
Posts: 5,584
Threads: 291
Joined: Nov 2012
City: Wilsonville
State, Province, Country: OR
Welcome to the Phorum!
If its playing well the voltage reading seems good to me. An alignment might be helpful as well.
Posts: 4,832
Threads: 437
Joined: Jun 2011
City: Boston
State, Province, Country: Massachusetts
Anthony, you live in the same town as one of our members, Morzh! Good luck and welcome to the land of Philco.
paul
Tubetalk1
Posts: 18,427
Threads: 622
Joined: Oct 2011
City: Jackson
State, Province, Country: NJ
Tony
Where in Jackson are you?
People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.
Posts: 5,651
Threads: 56
Joined: Sep 2008
City: Sandwick, BC, CA
Perhaps it was an error? The control grid voltage should never be positive on any audio output tube that I know of, maybe it was supposed to be -23 volts rather then 2.3 volts? If it was actually 2.3 volts the output would sound like garbage if it worked at all.
Regards
Arran
Posts: 4
Threads: 1
Joined: Jan 2016
City: Jackson NJ USA
(01-20-2016, 10:56 PM)morzh Wrote: Tony
Where in Jackson are you?
Hi Morzh,
I am on Autumn Avenue, between Diamond and Cobain roads. About 3 minutes from the Justice complex.
Posts: 4
Threads: 1
Joined: Jan 2016
City: Jackson NJ USA
Thanks for the help!
It does need an alignment (IF and the dial). Unfortunetly, the dial is brittle and in alot of little pieces. I ordered a replica replacement. When that comes in I should be able to do the dial and other alignments.
Yes, I'm in Jackson- near diamond road about 3 minutes form the Justice complex.
Also, I used to attend the NJARC meetings in Freehold with my grandfather until they moved to Princeton and Wall.
thanks again,
Anthony
Posts: 18,427
Threads: 622
Joined: Oct 2011
City: Jackson
State, Province, Country: NJ
Not too far, 6 minutes maybe. I am in a development by St Aloisius church, on Bennets Mills.
People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.
Posts: 4
Threads: 1
Joined: Jan 2016
City: Jackson NJ USA
(01-21-2016, 08:46 PM)morzh Wrote: Not too far, 6 minutes maybe. I am in a development by St Aloisius church, on Bennets Mills.
Yes, I know that area. My Kids went to St. Al's.
-Anthony
Users browsing this thread: 1 Guest(s)
|
|
Recent Posts
|
|
HiFi (Chifi) tube amp build - but my own design.
|
| It's the other forum. I'm also in DIY, but mostly read there. Honestly, I kinda jumped into this without much thought to...TV MAN — 10:43 AM |
|
Philco 71 Code 125
|
| Hello,
I am in need of a schematic for this radio. Mine has the three separate circular tube shields and a shadow me...dconant — 08:06 AM |
|
Stromberg Carlson 1500 Squeal
|
| And life just keeps getting more complicated.dconant — 07:57 AM |
|
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 |
|
Who's Online
|
| There are currently no members online. |
|
 
|
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
