How to select replacement 33rpm changer for 47-1230
Posts: 336
Threads: 13
Joined: Apr 2011
City: Montreal, Qc
When I started to work on my console radio, two comments came out very frequently...
first "that's a high tube count, this a hard project for a beginner" and I must admit it is true, its more challenging than smaller ones (that I got afterwards. I've seen schematics with less than 15 caps!)
Then, "those dynamic cartdriges are impossible to find, you might never get this changer to work again".
To be honest, I need to agree again, but more even is the fact that I don't own any 78rpm records and have not access to many, while I really like 33rpm LPs. (and singles too, but that's another story)
Therefore, I would like to know if it is possible to replace the changer for a 33RPM one, I don't really care about the style being that it goes "inside" the radio, but would like it to not look too much out of place.
It would need to be compatible, both electronically and mechanically -
electronically: needs to be compatible with the phono input of the radio;
mechanically: would be awesome if I could bolt it in the bolting brackets of the D10-A without having to alter the frame of the radio.
So... how do I find such a replacement radio... and more even, where do I find it?
any help appreciated. I'd hate to put a 70s turntable in that 40s wooden console.
-Mars
Posts: 2,128
Threads: 18
Joined: Oct 2008
City: Merrick, Long Island, NY
(04-15-2012, 05:54 PM)Marsupial Wrote: When I started to work on my console radio, two comments came out very frequently...
first "that's a high tube count, this a hard project for a beginner" and I must admit it is true, its more challenging than smaller ones (that I got afterwards. I've seen schematics with less than 15 caps!)
Then, "those dynamic cartdriges are impossible to find, you might never get this changer to work again".
To be honest, I need to agree again, but more even is the fact that I don't own any 78rpm records and have not access to many, while I really like 33rpm LPs. (and singles too, but that's another story)
Therefore, I would like to know if it is possible to replace the changer for a 33RPM one, I don't really care about the style being that it goes "inside" the radio, but would like it to not look too much out of place.
It would need to be compatible, both electronically and mechanically -
electronically: needs to be compatible with the phono input of the radio;
mechanically: would be awesome if I could bolt it in the bolting brackets of the D10-A without having to alter the frame of the radio.
So... how do I find such a replacement radio... and more even, where do I find it?
any help appreciated. I'd hate to put a 70s turntable in that 40s wooden console.
I't suggest a 1960's vintage VM (Voice of Music) changer. Millions upon millions were made, so they are cheap, work reasonably well, and you can still get some parts for them.
Of course turntables are still being made (not changers that I know of,) or rock bottom scrounge a turntable from the curb from one of those plastic solid state abominations and make if fit into your cabinet.
Posts: 13,776
Threads: 580
Joined: Sep 2005
City: Ferdinand
State, Province, Country: Indiana
My suggestion would be to use a changer from an early 1950s Philco console. The 1950 and newer changers will have a single tone arm and three speeds (33-1/3, 45 and 78 rpm).
Pros: Same brand, will look more "natural" in the set, may even mount the same as the 1947 changer which would be a definite plus.
Cons: The newer changer will use a ceramic cartridge with a higher output. This would overload your set's built-in phono preamp. You would want to change the cartridge anyway to one capable of playing 0.7 mil stereo records; the older LP styli were 1 mil and may damage your records.
So you are looking at some sort of modification, no matter which way you go.
It's worth the effort, though, if you really like the radio and want to keep it.
--
Ron Ramirez
Ferdinand IN
Posts: 2,128
Threads: 18
Joined: Oct 2008
City: Merrick, Long Island, NY
(04-16-2012, 10:44 AM)Ron Ramirez Wrote: My suggestion would be to use a changer from an early 1950s Philco console. The 1950 and newer changers will have a single tone arm and three speeds (33-1/3, 45 and 78 rpm).
Pros: Same brand, will look more "natural" in the set, may even mount the same as the 1947 changer which would be a definite plus.
Cons: The newer changer will use a ceramic cartridge with a higher output. This would overload your set's built-in phono preamp. You would want to change the cartridge anyway to one capable of playing 0.7 mil stereo records; the older LP styli were 1 mil and may damage your records.
So you are looking at some sort of modification, no matter which way you go.
It's worth the effort, though, if you really like the radio and want to keep it.
Agree, but earlier turntables act more like lathes than players on unobtanium records. Even the most recent vinyl is good for no more than 50 good plays, 100 at most. Like everything else, it depends.
Posts: 13,776
Threads: 580
Joined: Sep 2005
City: Ferdinand
State, Province, Country: Indiana
Ah yes, tracking weight - another factor to weigh (no pun intended).
Marsupial, do you have a migraine yet from all of these suggestions?
--
Ron Ramirez
Ferdinand IN
Posts: 336
Threads: 13
Joined: Apr 2011
City: Montreal, Qc
I do have a migraine, but only because I am working long hours. Bring'em on suggestions, I like that
I like the ideas, both voice of music and later Philcos. I definitely like the possibility of a 50s Philco changer that might fit in the mounting brackets of the radio. That is definitely a plus.
How does one go about changing the cartdrige?
and... do I get a transformer to adapt to the radio's input?
BTW I have been playing music out of other systems (radio, computer, mp3 player) directly into the phono input (it has an RCA-compatible plug) for a while - testing the recaped amp... I was under the impression that the arm of the D10 was stronger than modern ones. It does have its own transformer.
Next question is "where to find it"...? I have been looking at flea markets. While I can get a ton of 70s turntable, there's nothing pre-1960. The 70s ones aren't too bad, but those turntable where made to be HUGE and standalone. I doubt I can frankenstein it properly to my needs.
Oh, and I won't settle for a modern plastic turntable. The look, quality both mechanical and audio won't suit my needs. If I am to replace the changer, I'd like something that holds well.
-Mars
Posts: 4,682
Threads: 51
Joined: Sep 2008
City: Sandwick, BC, CA
Another possibilty would be to either replace the original cartridge for a ceramic type, there were some universal replacement types sold with adapter plates to fit different tone arms, or to have the original Rochelle salt crystal element replaced with a ceramic element.
Regards
Arran
Posts: 336
Threads: 13
Joined: Apr 2011
City: Montreal, Qc
Arran... do you mean converting the original changer to 33rpms?
If that's possible, I'm all for it. really.
-Mars
Posts: 4,682
Threads: 51
Joined: Sep 2008
City: Sandwick, BC, CA
(04-18-2012, 12:17 PM)Marsupial Wrote: Arran... do you mean converting the original changer to 33rpms?
If that's possible, I'm all for it. really.
No I don't think it's possible to convert a 78 rpm only player to a 33 1/3 rpm only player without being a machinist. I meant that you could rebuild the original cartridge with a new element so the machine will actually work or replace the original cartridge with a newer one with a ceramic element inside.
Regards
Arran
Users browsing this thread: 1 Guest(s)
|
Recent Posts
|
Jackson 715 not working
|
Mrfixr55, its working now. I cleaned the switches and sockets with spray cleaner. Thanks for helping on this one.daveone23 — 06:26 PM |
Jackson 715 not working
|
Now that you posted the schematic, I don't know why that Sprague electrolytic cap is across the meter, as it is not indi...MrFixr55 — 05:51 PM |
HiFi (Chifi) tube amp build - but my own design.
|
What may be lacking in the PP Tube amps may be the 2nd harmonics, which some, especially RCA back in the day called &quo...MrFixr55 — 05:32 PM |
Jackson 715 not working
|
Usually in an emission tester, the tube under test is measured as if it were a diode. So, some testers connect all the g...RodB — 04:17 PM |
Restoring Philco 37-604C
|
Yep. F5 is green, D5 is Red.
Red is Bad.
Green is Clean.morzh — 01:30 PM |
Jackson 715 not working
|
I did start to do that but I stalled out because I could not figure out how the grid and plate get voltage. In this diag...daveone23 — 11:52 AM |
Restoring Philco 37-604C
|
(Insert Homer Simpson "DOPF" Here.)
When all fails, look at the can. Took the Ron Ramirez advice, red Caig D...MrFixr55 — 09:23 AM |
Philco 91 Speaker Replacement
|
From your text I am not sure if you intend to use the existing speaker with a resistor instead of the field coil.
It wo...morzh — 08:44 AM |
Philco 91 Speaker Replacement
|
My field coil is bad. I am still hoping to find an original, but if I can't I will go with a fitting Philco speaker, 125...dconant — 08:34 AM |
Philco 91 Speaker Replacement
|
As Rod said, it is OK to use a fitting speaker, and then look for an original one.
If you buy a Hammond 125 output tr...morzh — 08:15 AM |
Who's Online
|
There are currently 4003 online users. [Complete List] » 1 Member(s) | 4002 Guest(s)
|
|
|
|