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 Post subject: Hi new here! Picked up an RCA 7HF3
PostPosted: Nov Sun 25, 2018 3:56 am 
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Joined: Nov Sun 25, 2018 3:27 am
Posts: 3
Hello! I am new to the Hifi community, an old friend just gave me an RCA 7HF3 it's in rough shape but most everything works. The Tuner mechanism is broken and doesn't turn. I looked in the back and the cord on the pulleys seems to be gone. The record player is in pretty rough shape but plays. Any insight on where to source parts and how to restore this beauty would be greatly appreciated. I am mechanically and electronically inclined. I would like to get my hands dirty and get this baby tip top!

I'd like to add pictures but I think I am too new! :D


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 Post subject: Re: Hi new here! Picked up an RCA 7HF3
PostPosted: Nov Sun 25, 2018 7:03 am 
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Joined: Feb Sat 06, 2016 1:47 am
Posts: 2907
Location: La Mesa Califonia
Schematic found here. Replace the filter capacitors first off. C32A and C32B

http://oldtech.net/RCA.html


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 Post subject: Re: Hi new here! Picked up an RCA 7HF3
PostPosted: Nov Sun 25, 2018 7:12 am 
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Joined: Jan Tue 31, 2012 1:55 am
Posts: 8825
Location: Mountains of Mourne. Ireland.
Eight page service manual for tuner and amp/audio unit, thanks to bill J.
viewtopic.php?p=1942809#p1942809

Previous discussions here at arf...
https://www.google.com/search?q=7HF3&sa ... radios.com


You can post photos as attachments straight out of the chute. No need to wait 24Hrs.
Posting photos to a forum thread...
The skinny: viewtopic.php?p=2717120#p2717120

Greg.


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 Post subject: Re: Hi new here! Picked up an RCA 7HF3
PostPosted: Nov Sun 25, 2018 5:55 pm 
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Joined: Jan Tue 31, 2012 1:55 am
Posts: 8825
Location: Mountains of Mourne. Ireland.
Sams service manual (16-pages) for RP-205 record changer, thanks to Bill J.
viewtopic.php?p=2048014#p2048014


RP-205
https://www.radiomuseum.org/r/rca_rp_205_rp205.html


22-pages of service information for RP (record player) series 205 can also be found in...
Beitman's Most-Often-Needed 1957
available to download here...
https://www.americanradiohistory.com/Beitman-Manual.htm

Greg.


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 Post subject: Re: Hi new here! Picked up an RCA 7HF3
PostPosted: Nov Mon 26, 2018 3:11 am 
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Joined: Dec Sat 24, 2011 9:17 pm
Posts: 4250
Location: Vancouver Island, Canada
Here's a link with pictures and info. It says 1954 but I'd say that was a poor guess. Radios in Beitman's 1957 edition are generally 1956 models.

https://www.radiomuseum.org/r/rca_7hf3_ ... k_lll.html

That amp has push/pull 6V6 output, and that is a good thing, and it is an AM/FM tuner, good features.
Capacitors are the weak components, especially the electrolytics mentioned above, and those that are rolled paper dipped in wax. Check carefully for discolored or baked resistors. Use your DMM to check them. Remember to keep fingers out when it is powered up. Vacuum tubes use high voltages, in the range of 300 vac in this amp and in the tuner.

Use the Search feature at the top of this page to learn more general techniques.

For example to check the power transformers before proceeding, pull the rectifier tubes, and once you know where to place your probe, you can measure the AC voltage at the rectifier socket.

_________________
Watch the doughnut, not the hole.
Burl Ives, RIP, oldtimer.
[:l>)


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 Post subject: Re: Hi new here! Picked up an RCA 7HF3
PostPosted: Nov Mon 26, 2018 5:10 am 
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Joined: Nov Sun 25, 2018 3:27 am
Posts: 3
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Here she is!
Wow Thanks for the wealth of information! I'm gonna be sifting through all of this for a bit!


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 Post subject: Re: Hi new here! Picked up an RCA 7HF3
PostPosted: Nov Mon 26, 2018 2:00 pm 
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Joined: Feb Wed 04, 2015 12:26 am
Posts: 881
As an FYI, do NOT power this up the capacitors are replaced. If a cap shorts, it can cause a cascade failure and at the very least, take a irreplaceable component out or at the worst, start a fire.


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 Post subject: Re: Hi new here! Picked up an RCA 7HF3
PostPosted: Nov Tue 27, 2018 4:04 am 
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Joined: Nov Sun 25, 2018 3:27 am
Posts: 3
Wow thanks for the heads up! I already had powered it up for a few hours when I first got it to check out what worked and what didn't.

I was able to source capacitors from a friend who works on CB and short wave radios here in South Texas. I will post some pics once I get this unit apart.


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