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 Post subject: Silvertone radio tube substitutions
PostPosted: Sep Wed 21, 2022 11:52 pm 
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Joined: Sep Wed 21, 2022 11:39 pm
Posts: 3
Location: Woodinville, wa
I have a Silvertone 8052 radio and would like to know if a 7c7 vacumn tube can be substituted directly for the 7b7? Also are there any substitues for the 14Q7 tube in this radio?


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 Post subject: Re: Silvertone radio tube substitutions
PostPosted: Sep Thu 22, 2022 3:46 am 
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Joined: Oct Wed 14, 2009 5:36 am
Posts: 7170
Location: Queens, New York, USA
The 7C7 is not a substitute for 7B7. But you can use a 14A7 or 12B7.
Findatube.com has those tubes and the 14Q7 for $3.50 or $4.00 each, no need to substitute.


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 Post subject: Re: Silvertone radio tube substitutions
PostPosted: Sep Thu 22, 2022 3:54 am 
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Joined: Jan Thu 01, 1970 12:00 am
Posts: 4801
Location: Oak Creek, WI USA
Neither one has a good sub but they are electrically safe enough and might allow the radio to at least try to function.

7C7 is a sharp cutoff tube while 7B7 is remote cutoff. You will have AVC related issues. As mentioned above if you have 14A7 use that instead.

7A8 might work in place of 14Q7. Problem is that they were designed for different oscillator types. You're looking for a 150mA mixer-oscillator. 14Q7 is essentially a loktal 12SA7. 7A8 is a loktal 6D8. Both 150mA tubes but used different oscillator circuits. 7A8 will also raise heater voltages through the set because it's dropping six fewer volts. All you can do is try for testing purposes.

7B7 and 14Q7 are both very inexpensive. Make sure you order the right tubes promptly; don't keep any subs you try.


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 Post subject: Re: Silvertone radio tube substitutions
PostPosted: Sep Thu 22, 2022 4:40 am 
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Joined: Sep Wed 21, 2022 11:39 pm
Posts: 3
Location: Woodinville, wa
Thank-you both for your replies. I am grateful for any information and sources like you've mentioned.
Bill


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 Post subject: Re: Silvertone radio tube substitutions
PostPosted: Sep Thu 22, 2022 6:19 am 
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Joined: Sep Mon 16, 2013 1:42 am
Posts: 5864
Location: Tucson, Arizona U.S.A.
Location: Tucson, Arizona U.S.A.
The problem with substituting tubes in a non-working radio is that if the radio still doesn't work, you don't know if it is a problem with the radio, a poor substitute tube, or both.

_________________
Jim Mueller

Who's that swimming in the punch bowl?
It's Walter Wart, the freaky frog!


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 Post subject: Re: Silvertone radio tube substitutions
PostPosted: Sep Fri 23, 2022 2:49 am 
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Joined: Sep Wed 21, 2022 11:39 pm
Posts: 3
Location: Woodinville, wa
I understand the point about the substitutes. The 7B7 is not what I consider inexpensive, $12 to $20., but with more sources I found some that are inexpensive at $3.50 used- $7.00 new. I need two in this radio. I'm glad I joined your forum! Thanks!


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