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 Post subject: RCA Victor SHF-8 No sound
PostPosted: Jun Wed 09, 2021 5:03 pm 
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Joined: Jun Wed 09, 2021 4:40 pm
Posts: 3
I am restoring my first record player (RCA Victor SHF-8). So far I have re-capped it. Then it was working fairly well with my stack of 78. Some records worked others didn’t. It was almost like the sound wasn’t reaching some kind of threshold and the amp wasn’t amplifying the sound. However, some records would work eventually if I I kept hitting the Rejt switch...like it was resetting the power to the needle. Then a played a record with a big crack in it (didn’t realize it at the time) and broke the needle. I had a hard time finding a new needle (the old one said 80D on it), but I found a good deal on a Sonotone 2T so I installed that instead with a new needle. Now when the needle drops there is like a static pop almost and then no sound. When I wiggle the 12ax7 tube I hear static but nothing from the record. Any help would be appreciated.


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 Post subject: Re: RCA Victor SHF-8 No sound
PostPosted: Jun Wed 09, 2021 7:52 pm 
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Joined: Jan Wed 16, 2013 12:04 am
Posts: 2409
Location: 77001
nhollinger wrote:
I am restoring my first record player (RCA Victor SHF-8). So far I have re-capped it. I found a good deal on a Sonotone 2T so I installed that instead with a new needle.

Now when the needle drops there is like a static pop almost and then no sound. When I wiggle the 12ax7 tube I hear static but nothing from the record. Any help would be appreciated.

Welcome to the Phono Forum.

1. Re-check all your work carefully.

Look for errant solder drops shorting something.
MIs-wire of components, et cetera.

2. Post the schematic.

3. Are all tube filaments working ?
3.a. Tubes checked for shorts, function ?

4. Did you check all resistors ?

5. Check audio wiring for continuity from
cart to underside of changer, and to amp.

Hotwax


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 Post subject: Re: RCA Victor SHF-8 No sound
PostPosted: Jun Wed 09, 2021 8:27 pm 
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Joined: Jun Wed 09, 2021 4:40 pm
Posts: 3
Thanks! I have not done anything with the resistors. The tubes at least glow. Here is the schematic. I have continuity from the cart to amp. How do I check resistors?


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 Post subject: Re: RCA Victor SHF-8 No sound
PostPosted: Jun Wed 09, 2021 9:03 pm 
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Joined: Jan Wed 16, 2013 12:04 am
Posts: 2409
Location: 77001
Okay, you will need a digital or analog multi-meter to
place the test leads on each side of the resistor.
Meter will be set to Ohms.

DO NOT do resistor checks with the amplifier powered on.

Unplug the amplifier from the wall, and be very
careful around the electrolytic filter caps.
They can hold a lethal charge of electricity.

In these age record players the tolerance is
usually 10 to 20 % over or under the stated
resistor value in Ohms.

Usually a very high resistance reading over
the resistor value indicates a bad resistor.

Did you replace all electrolytic and wax/paper caps ?
I read you re-capped the amp, just checking.

You could check in your locale for a vintage radio club,
whose members would be able to check the tubes.
They also would be able to do voltage checks on
the live/hot chassis.

You should not do voltage checks if you have no experience and do not
fully understand how to safely work with high voltage
which can kill a person.

Hotwax


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 Post subject: Re: RCA Victor SHF-8 No sound
PostPosted: Jun Thu 10, 2021 3:12 am 
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Joined: Dec Mon 23, 2019 5:52 pm
Posts: 509
Sonotone 2Ts haven't been manufactured in years. Are you sure the one you got was good ?


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 Post subject: Re: RCA Victor SHF-8 No sound
PostPosted: Jun Thu 10, 2021 5:38 pm 
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Joined: Jun Wed 09, 2021 4:40 pm
Posts: 3
I don’t know for sure that it’s good. What is a good way to know?


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 Post subject: Re: RCA Victor SHF-8 No sound
PostPosted: Jun Fri 11, 2021 12:24 am 
Member

Joined: Jan Wed 16, 2013 12:04 am
Posts: 2409
Location: 77001
nhollinger wrote:
I don’t know for sure that it’s good. What is a good way to know?

To test the Sonotone 2-T cart, you will need another amplifier and speakers
to connect to the 2-T.

Do you happen to have another record player or turntable that
is working ?

Hotwax


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