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 Post subject: Re: Mysterious circuit ! Help, any indication ?
PostPosted: Jan Tue 15, 2013 11:04 am 
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Joined: Jan Sun 13, 2013 7:31 pm
Posts: 16
Hello! - I live at Italy. I have great passion for valves and transistor radio - but this transistor circuit is too intriguing! I apologize if someone disturbs (there not reason). In PBC transformers are this position (output will transform has 7-connections). Never seen anything like


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 Post subject: Re: Mysterious circuit ! Help, any indication ?
PostPosted: Jan Tue 15, 2013 1:04 pm 
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Joined: Jun Tue 21, 2011 8:27 pm
Posts: 3320
Location: Flint Hill, Virginia
Ok Guys... I was wrong. This is part of an old transistor radio.
(Actually, it is the makings of the Deacy Amplifier as used by Brian May).
However, I was correct that it dates to about 1964, since I've found it in TSM-60, (October 1965).

Can't decide if this is an elaborate hoax by Fifties or xrHonda?? :lol: :lol:
It appears to be the work of a unscrupulous person willing to exploit the expertise of others.
Yes - - - - - I am talking about Yuri/DuroNin. See this thread:
http://85.92.85.233/forum/forum/showthr ... be&t=92370
Image

Image

Dave D was right. This is an audio output module from a Supersonic PR80.
Four band AM/FM/SW1/SW2 receiver.

Back side of the board:
Image

Image

Here's the complete service manual / schematic from Sams:
http://oi49.tinypic.com/2is6s8h.jpg
http://oi48.tinypic.com/2j3fe3k.jpg
http://oi47.tinypic.com/16gya7l.jpg
http://oi48.tinypic.com/149b0j4.jpg
http://oi48.tinypic.com/149b0j4.jpg
http://oi47.tinypic.com/14ltrno.jpg
http://oi50.tinypic.com/21ada1f.jpg
http://oi47.tinypic.com/7107lj.jpg
http://oi50.tinypic.com/2dahkpw.jpg
http://oi45.tinypic.com/14sml2v.jpg
http://oi48.tinypic.com/281rh1c.jpg
http://oi48.tinypic.com/2lky25s.jpg

Somebody owes me a cheeseburger for 10 years of hard work,
~ Mitch ~


Last edited by PBPP on Jan Tue 15, 2013 9:55 pm, edited 2 times in total.

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 Post subject: Re: Mysterious circuit ! Help, any indication ?
PostPosted: Jan Tue 15, 2013 1:17 pm 
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Joined: Jan Sun 13, 2013 7:31 pm
Posts: 16
Mitch !!!!!!!! :shock: :shock: :shock: :D MANY,MANY , MANY ,MANY, MANY ,MANY - THANKS !!!!!!!You're a genius (I really think so). I have to make a great gift for you! THANKS !I wonder where I can buy to find this radio?


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 Post subject: Re: Mysterious circuit ! Help, any indication ?
PostPosted: Jan Tue 15, 2013 1:32 pm 
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Joined: Jan Sun 13, 2013 7:31 pm
Posts: 16
10 years to look empty to me ... Then comes Mitch, so ... Mitch you made me very happy! great day for me! Thanks Mitch (and all participants) . Yuri


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 Post subject: Re: Mysterious circuit ! Help, any indication ?
PostPosted: Jan Tue 15, 2013 1:42 pm 
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Joined: Jan Sun 13, 2013 7:31 pm
Posts: 16
An tip, an help for me? Here on the forum - someone can help me , (buy) this radio . Where? Price is not a problem! Thanks


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 Post subject: Re: Mysterious circuit ! Help, any indication ?
PostPosted: Jan Tue 15, 2013 4:06 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 20865
Location: Utica, NY 13502 (USA)
Dave Doughty wrote:
To me, this looks like the audio output module in a Supersonic model P.R. 80 (lunchbox size) transistor radio I once had. I believe an extra secondary winding was used in conjunction with a negative feedback circuit.

Seems like I was right all along. :wink:

Dave


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 Post subject: Re: Mysterious circuit ! Help, any indication ?
PostPosted: Jan Tue 15, 2013 4:19 pm 
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Joined: Jun Tue 21, 2011 8:27 pm
Posts: 3320
Location: Flint Hill, Virginia
Dave Doughty wrote:
Dave Doughty wrote:
To me, this looks like the audio output module in a Supersonic model P.R. 80 (lunchbox size) transistor radio I once had. I believe an extra secondary winding was used in conjunction with a negative feedback circuit.
Seems like I was right all along. :wink:

Dave
Yeah... and I acknowledged that in my post. That's why your the Awesome Moderator Dude! :wink:
Me? - I just work for cheeseburgers. :(

~ Mitch ~


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 Post subject: Re: Mysterious circuit ! Help, any indication ?
PostPosted: Jan Tue 15, 2013 4:35 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 20865
Location: Utica, NY 13502 (USA)
Yeah, but I originally thought it was from a Nordmende. I didn't see your post sandwiched between the pictures..sorry.

Dave


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 Post subject: Re: Mysterious circuit ! Help, any indication ?
PostPosted: Jan Tue 15, 2013 5:10 pm 
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Joined: Sep Fri 07, 2007 2:21 am
Posts: 2069
Location: Brunswick, ME 04011 (USA)
...well...we've solved that mystery...but it does look like someone tried to 'repurpose' that AF board...
...and that's a rather interesting P-P output stage...into an autotransformer?...


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 Post subject: Re: Mysterious circuit ! Help, any indication ?
PostPosted: Jan Tue 15, 2013 6:04 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 185
Location: Sweden
Autotransformers were used by several European manufacturers such as AGA,Braun,Ingelen,Saba,Loewe-Opta,Schaub-Lorenz and more.Sometimes with a high impedance(80-150 ohm) loudspeaker across the whole winding and sometimes with lower impedance loudspeakers on tappings.
These high impedance loudspeakers aren't easy to find nowadays.
What's very unusual is the two feedback windings.I've only seen something similar once before and that's in the Bush TR82C.Sort of reminds you of the Dynaco 70 ultralinear...Maybe someone knows more examples of transistor amps with feedback like this?


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 Post subject: Re: Circuit , indication ?
PostPosted: Jan Tue 15, 2013 6:39 pm 
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Location: Flint Hill, Virginia
I'm confused.....

Why would a noob ask a question here on ARF, have his question answered,
then change the title and delete pictures??? Are you trying to hide something Yuri?

~ Mitch ~

P.S. - I've reposted the remaining photographs so they can't be deleted.
Image

Image

Image


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 Post subject: Re: Circuit , indication ?
PostPosted: Jan Tue 15, 2013 8:02 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 185
Location: Sweden
He has posted the same question here too(and there are more pictures!):
http://85.92.85.233/forum/forum/showthread.php?t=92370


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 Post subject: Re: Circuit , indication ?
PostPosted: Jan Tue 15, 2013 8:30 pm 
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Joined: Sep Fri 07, 2007 2:27 am
Posts: 6318
Location: Grand Chute, Wisconsin
PBPP wrote:
I'm confused.....

Why would a noob ask a question here on ARF, have his question answered,
then change the title and delete pictures??? Are you trying to hide something Yuri?

~ Mitch ~


I think he's trying to keep the results of the search a secret, until he can find some of the radios in question and make some replicas to sell.

http://compare.ebay.com/like/4002673221 ... s&var=sbar

Probably a hot item like bumblebee caps to the guitar crowd.



.


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 Post subject: Re: Circuit , indication ?
PostPosted: Jan Tue 15, 2013 9:42 pm 
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Joined: Jun Tue 21, 2011 8:27 pm
Posts: 3320
Location: Flint Hill, Virginia
I'd like to see the thread restored back to the original content,
seeing that I made a significant contribution here.
I would sincerely appreciate if one of the moderators could do this! :!:

- - - - - - - - - - - - - - - - - - - - - - -

For anyone who runs across this thread... it details the Deacy Amplifier as used by Brian May.
I know the GoogleBot will easily index this so it becomes easily searchable. Sorry Yuri. :) :)

- - - - - - - - - - - - - - - - - - - - - - -

Here are three other photos which were deleted from this thread:
Image

Image

Image

~ Mitch ~


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 Post subject: Re: Circuit , indication ?
PostPosted: Jan Tue 15, 2013 9:59 pm 
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Joined: Sep Fri 07, 2007 2:27 am
Posts: 6318
Location: Grand Chute, Wisconsin
Thanks, Mitch. I also regret Yuri's decision to attempt to hide what has been an interesting little mystery.

I dislike when people come here to (ab)use the generous time and knowledge of our members for their own selfish gains.

:(

.


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 Post subject: Re: Circuit , indication ?
PostPosted: Jan Wed 16, 2013 1:23 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 20865
Location: Utica, NY 13502 (USA)
Can't restore it but it can be locked. I agree that members who put effort into this thread were exploited by our friend. This thread is locked to avoid further conflict.

Dave


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 Post subject: Re: Circuit , indication ? (Supersonic PR 80)
PostPosted: Jan Thu 17, 2013 6:53 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 17885
Location: Berkeley, CA 94709
As a final note on this thread, as it became somewhat mangled due to deletions and additions. The circuit in question is from a Supersonic PR 80 portable radio. It is highly sought after by guitar players because its amplifier can be used to create a Brian May Deacy Amp:

http://en.wikipedia.org/wiki/Deacy_Amp

Queen guitarists John Deacon and Brian May constructed his prototype using parts from a radio (presumably the Supersonic PR 80) that Deacon found in a dumpster.

Replicas of this amp sell for upwards of 800 British Pounds on eBay, so you can imagine what one made from original parts would be worth.

Bob

_________________
"The stupider it looks, the more important it probably is!" -- J.R. "Bob" Dobbs


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 Post subject: Re: Circuit , indication ? (Supersonic PR 80)
PostPosted: Jan Sat 26, 2013 12:46 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 20865
Location: Utica, NY 13502 (USA)
One final, final comment:

I am being swamped with PM's asking me for help in finding this model radio. Not gonna happen but I echo Bob's comments about the potential worth of the radio or it's amp module.

Dave


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