Posts: 70
Threads: 17
Joined: Jan 2006
City: Newbern
State, Province, Country: Tennessee
Have a RP3. Recapped, replaced resistors, and installed a new crystal cartridge. Still will only broadcast about 2ft. no more. Checked tubes, strong. am I missing something?
Posts: 2,118
Threads: 112
Joined: Jun 2010
City: Medford OR (OR what?)
I would suspect that many people have no idea what an RP3 is (I once worked on a Sonora RP3). Maybe if you told us a little more about it - picture?
https://www.radiomuseum.org/r/philco_rp3.html
"I just might turn into smoke, but I feel fine"
http://www.russoldradios.com/
Posts: 70
Threads: 17
Joined: Jan 2006
City: Newbern
State, Province, Country: Tennessee
It's a Philco wireless 1939 record player.
Posts: 1,256
Threads: 32
Joined: Jan 2014
City: Wellborn Florida
What kind of ant. are you using?
Posts: 70
Threads: 17
Joined: Jan 2006
City: Newbern
State, Province, Country: Tennessee
one used in the original factory design.
Posts: 7,295
Threads: 268
Joined: Dec 2009
City: Roslyn Pa
When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got!
Terry
Posts: 70
Threads: 17
Joined: Jan 2006
City: Newbern
State, Province, Country: Tennessee
Posts: 7,295
Threads: 268
Joined: Dec 2009
City: Roslyn Pa
So how much ac voltage do you have from pin 2 of the 84 to chassis and pin 3 to the chassis?
When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got!
Terry
Posts: 2,118
Threads: 112
Joined: Jun 2010
City: Medford OR (OR what?)
So you have a 6A7 doing its thing ( it is normally a osc/mixer in a receiver).
What is your plate voltage? Have you looked at it with a scope, how about a signal sniffer. I would suspect that a really good 6A7 might be required to get good range, not my favorite tube - still trying to get the Strat to osc. on band 5, reliably.
"I just might turn into smoke, but I feel fine"
http://www.russoldradios.com/
(This post was last modified: 12-09-2020, 06:26 PM by Phlogiston.)
Posts: 70
Threads: 17
Joined: Jan 2006
City: Newbern
State, Province, Country: Tennessee
105.1 v pin 2 and 105.4 pin 3
Posts: 70
Threads: 17
Joined: Jan 2006
City: Newbern
State, Province, Country: Tennessee
plate on the 6A7 is 101.5v
Posts: 2,118
Threads: 112
Joined: Jun 2010
City: Medford OR (OR what?)
Is that 1 meg variable resistor good? What happens when you adjust it?
"I just might turn into smoke, but I feel fine"
http://www.russoldradios.com/
Posts: 70
Threads: 17
Joined: Jan 2006
City: Newbern
State, Province, Country: Tennessee
yes. it shuts down the transmitting when turned be it on a little over 2 ft.
Posts: 2,118
Threads: 112
Joined: Jun 2010
City: Medford OR (OR what?)
I would think that it would vary the RF output considerably through the range, 0 to 1meg. So if you measure from the high side (xtal) to ground you get 1 meg.? I have to ask - again, because these Philco controls are often the problem, especially if they have been "cleaned".
It may also vary the output freq. a little. What is you output freq?
"I just might turn into smoke, but I feel fine"
http://www.russoldradios.com/
Posts: 16,476
Threads: 573
Joined: Oct 2011
City: Jackson
State, Province, Country: NJ
6A7 tubes are often weak. The Mixing part.
Maybe it just needs replacement.
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.
Users browsing this thread: 2 Guest(s)
|
|
Recent Posts
|
|
First Radio restoration
|
| You could post in the WANTED ADs section here on the Phorum and see if anyone has an RF generator that they want to sell...klondike98 — 11:55 AM |
|
Zenith H725
|
| Good ideas, thank you Arrange and Rich. I have the adhesive aluminum foil already and can try that immediately.
More ...EdHolland — 10:18 AM |
|
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 |
|
Who's Online
|
There are currently 2613 online users. [Complete List]
» 4 Member(s) | 2609 Guest(s)
|
|
|
|
 
|
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
