Forums :: Resources :: Features :: Photo Gallery :: Vintage Radio Shows :: Archives
Support This Site: Contributors :: Advertise


It is currently Sep Tue 17, 2019 8:34 pm


All times are UTC [ DST ]





Post New Topic Post Reply  [ 11 posts ] 
Author Message
 Post subject: Possible Inexpensive preamp for this little ss phono ?
PostPosted: Apr Sun 21, 2019 1:29 am 
Member

Joined: Jan Wed 16, 2013 12:04 am
Posts: 1556
Location: 77001
Hello all,
I don't know if anyone is like me, but I hate to throw away
things I "believe" I can cobble together for fun and function.

So, to repair another 1960's Sears record player with the
same record changer, I used the one from this little 6262.

Now I have a neat little cabinet and the SS amp. I have
rebuilt a 1950's V-M record changer and made a plinth for
it to go into the little Sears cabinet.

This SS amp needs a high output cartridge of 2 Volts, meaning
I'd have to buy a crystal cart. But, as we know they can go
bad, even it they start out good.

So, any ideas on a preamp chip circuit off the shelf I
could buy and connect to this SS amp ?

The ceramic carts I have are from 0.5 to 1 volt output
that will go into the Voice of Music.

Thanks ! Hotwax


Attachments:
Sears 6262.jpg
Sears 6262.jpg [ 75.84 KiB | Viewed 538 times ]
Top
 Profile  
 
 Post subject: Re: Possible Inexpensive preamp for this little ss phono ?
PostPosted: Apr Sun 21, 2019 2:46 pm 
Member

Joined: May Fri 15, 2015 4:33 am
Posts: 408
Location: Oakland, CA
[url][/url]I use a Pyle P444 ... think I paid less than twenty bucks for it. Here's a link - under $16!

Quote:


Top
 Profile  
 
 Post subject: Re: Possible Inexpensive preamp for this little ss phono ?
PostPosted: Apr Sun 21, 2019 10:04 pm 
Member

Joined: Dec Wed 28, 2016 5:15 am
Posts: 34
Location: 15234
Output from a ceramic cartridge would be too much for a magnetic preamp .It will
distort . Something more like this would work better .Though you would have to
assemble it . https://www.parts-express.com/yuan-jing ... uctDetails


Top
 Profile  
 
 Post subject: Re: Possible Inexpensive preamp for this little ss phono ?
PostPosted: Apr Mon 22, 2019 6:18 am 
Member
User avatar

Joined: Jan Thu 01, 1970 1:00 am
Posts: 32685
Location: SoCal, 91387
davek65 wrote:
Output from a ceramic cartridge would be too much for a magnetic preamp .It will
distort . Something more like this would work better .Though you would have to
assemble it . https://www.parts-express.com/yuan-jing ... uctDetails

That's for a stereo; his print shows only one speaker. I would suggest trying one of the LM386 assembled amp boards that are very prevalent on eBay.

_________________
\\\\\\\\\\\\\\\\\\\\\\\\He Who Dies With The Most Radios Wins//////////////////


Top
 Profile  
 
 Post subject: Re: Possible Inexpensive preamp for this little ss phono ?
PostPosted: Apr Mon 22, 2019 3:43 pm 
Member

Joined: Jan Wed 16, 2013 12:04 am
Posts: 1556
Location: 77001
Thanks everyone for the suggestions.

Yes, this is just an inxepensive little mono amp with
one speaker, a 1960's teenager record player.
But it would be fun to resurrect it as a working unit.

So, I'm very low knowledge on
how I would wire up such a pc board pre-amp ?

Do these need a separate power supply, et cetera ?

Hotwax


Top
 Profile  
 
 Post subject: Re: Possible Inexpensive preamp for this little ss phono ?
PostPosted: Apr Mon 22, 2019 7:09 pm 
Member

Joined: Jan Thu 01, 1970 1:00 am
Posts: 4265
Location: Boston, MA USA
I would not invest too much money or time into that amplifier. It is an early solid-state design which in my experience rarely sounds good and is likely to be problematic. I recommend using your VM changer with either an earlier amplifier with vacuum tubes or a later, proper solid-state one with silicon transistors and a more modern circuit. The early to mid-1960s were a difficult time period for solid-state.

-David


Top
 Profile  
 
 Post subject: Re: Possible Inexpensive preamp for this little ss phono ?
PostPosted: Apr Mon 22, 2019 7:34 pm 
Member

Joined: Jan Wed 16, 2013 12:04 am
Posts: 1556
Location: 77001
dberman51 wrote:
I would not invest too much money or time into that amplifier. It is an early solid-state design which in my experience rarely sounds good and is likely to be problematic. I recommend using your VM changer with either an earlier amplifier with vacuum tubes or a later, proper solid-state one with silicon transistors and a more modern circuit. The early to mid-1960s were a difficult time period for solid-state.-David

Thank you David for putting that perspective out there.
I could tell there is very little power output from the amp.
I'll hang on to the cabinet, and wait for another donor amp
as you suggest.
Hotwax


Top
 Profile  
 
 Post subject: Re: Possible Inexpensive preamp for this little ss phono ?
PostPosted: Apr Mon 22, 2019 8:17 pm 
Member

Joined: Dec Wed 28, 2016 5:15 am
Posts: 34
Location: 15234
Here's an amp module for less than $15

https://www.parts-express.com/kemo-m031 ... e--320-551


Top
 Profile  
 
 Post subject: Re: Possible Inexpensive preamp for this little ss phono ?
PostPosted: Apr Mon 22, 2019 8:22 pm 
Member
User avatar

Joined: Jan Thu 01, 1970 1:00 am
Posts: 32685
Location: SoCal, 91387
You can get them all day long from eBay Chinese sellers, starting at 2+ bucks for 35 watts;
https://www.ebay.com/sch/32852/i.html?_ ... c&LH_BIN=1

_________________
\\\\\\\\\\\\\\\\\\\\\\\\He Who Dies With The Most Radios Wins//////////////////


Top
 Profile  
 
 Post subject: Re: Possible Inexpensive preamp for this little ss phono ?
PostPosted: Apr Wed 24, 2019 3:19 am 
Member

Joined: Dec Wed 28, 2016 5:15 am
Posts: 34
Location: 15234
That little module puts out 3.5 watts not 35 watts . Don't think those little speakers
would handle 35 watts . Did you read the specks .?


Top
 Profile  
 
 Post subject: Re: Possible Inexpensive preamp for this little ss phono ?
PostPosted: Apr Wed 24, 2019 6:30 am 
Member
User avatar

Joined: Jan Thu 01, 1970 1:00 am
Posts: 32685
Location: SoCal, 91387
The link shows a variety of amps. The $2+ with free shipping using the TDA8932 chip puts out 35 (thirty five) watts.

_________________
\\\\\\\\\\\\\\\\\\\\\\\\He Who Dies With The Most Radios Wins//////////////////


Top
 Profile  
 
Post New Topic Post Reply  [ 11 posts ]  Moderator: Alan Voorhees

All times are UTC [ DST ]


Who is online

Users browsing this forum: No registered users and 4 guests



Search for:
Jump to:  




























Privacy Policy :: Powered by phpBB