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 Post subject: Sony Stereo Adapter for Transistor Radios
PostPosted: Oct Sat 06, 2018 2:36 pm 
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I found this Sony model STA-110 FM stereo adaptor on ebay last week. It plugs into the MPX and AUX jacks found on many Sony transistor radios that have FM. It comes with about 4' of cord with dual mini-plugs attached spaced to match the jacks on the radio and runs on 3 C-cells. I'm surprised how it really enhances the sound of my portables that have this output/input feature. The adaptor provides the left channel while the radio plays the right channel.

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Shown here with my Sony TFM-1600 multiband set that I acquired at an estate sale this past Summer.

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Dave


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 Post subject: Re: Sony Stereo Adapter for Transistor Radios
PostPosted: Oct Sat 06, 2018 4:33 pm 
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Location: Rayleigh, BC, CANADA
indeed these are very cool, good stereo separation and works well with some of my other radios with multiplex jacks, the 6F-21WA including my Transonic which is a re-branded Toshiba.

it's a nice accessory to have for sure.


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SONY 6F-21WA AM-FM.jpg
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 Post subject: Re: Sony Stereo Adapter for Transistor Radios
PostPosted: Oct Sat 06, 2018 4:38 pm 
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Wow, I didn't know these existed. But I would not have bought one back in the day. Seems kinda superfluous with the kind of audio quality you get from a small transistor radio anyway...

I guess I would have been the guy building speakers and hifi amplifiers. (oh wait, I'm already that guy!)

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 Post subject: Re: Sony Stereo Adapter for Transistor Radios
PostPosted: Oct Sat 06, 2018 5:24 pm 
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I wouldn't have bought one back in the day either but I found a good deal on one a few years ago.

I've had the 6F-21WA for many years so it was time to get the adapter.

Dave are you sure the model number is STA-124? never heard of that one.

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 Post subject: Re: Sony Stereo Adapter for Transistor Radios
PostPosted: Oct Sat 06, 2018 5:53 pm 
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Dave's photos are titled 110... :)

Greg.


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 Post subject: Re: Sony Stereo Adapter for Transistor Radios
PostPosted: Oct Sat 06, 2018 6:35 pm 
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egg wrote:
Dave's photos are titled 110... :)

Greg.

So....are you saying Dave needs to drink more coffee or do I? :mrgreen:

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 Post subject: Re: Sony Stereo Adapter for Transistor Radios
PostPosted: Oct Sat 06, 2018 7:44 pm 
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Dave should stop buying radios. Lol

I've just fallen off the wagon... 120days without purchasing a radio, until last week.

Greg.


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 Post subject: Re: Sony Stereo Adapter for Transistor Radios
PostPosted: Oct Sat 06, 2018 8:56 pm 
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egg wrote:
Dave should stop buying radios. Lol

I've just fallen off the wagon... 120days without purchasing a radio, until last week.

Greg.

I never got on the wagon, I've purchased 3 Sony radios and a tape recorder in the last 120 days :)

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 Post subject: Re: Sony Stereo Adapter for Transistor Radios
PostPosted: Oct Sat 06, 2018 9:17 pm 
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Rocco53 wrote:
I wouldn't have bought one back in the day either but I found a good deal on one a few years ago.

I've had the 6F-21WA for many years so it was time to get the adapter.

Dave are you sure the model number is STA-124? never heard of that one.

I don't know how the 124 got there. Correction was made.

It is interesting to learn that the 110 adaptor works with other brands of radios. I wonder if the speaker phasing is correct?

My TFM-1600 is a pretty good sounding radio and the 110 enhances the sound although it obviously doesn't have much bass. I've heard that anything below about 200 Hz is blended to mono in recordings and those frequencies are basically non-directional anyway. Is this true?

Yes, I did fall off the wagon and need to start selling again.

Dave


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 Post subject: Re: Sony Stereo Adapter for Transistor Radios
PostPosted: Oct Sat 06, 2018 10:20 pm 
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Dave Doughty wrote:
I've heard that anything below about 200 Hz is blended to mono in recordings and those frequencies are basically non-directional anyway. Is this true?

I don't know about this but maybe someone here can answer this.

I did however reverse the speaker leads on one of the units, can't remember which one, and it did sound a tiny bit better, not worth the trouble, it's only a 4 x 2-1/2 inch speaker, can't expect much from that.

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 Post subject: Re: Sony Stereo Adapter for Transistor Radios
PostPosted: Oct Sat 06, 2018 10:55 pm 
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Hello Dave,
I have never seen that adapter in person but have seen the service manual before that is a real neat find .
Anyway I am glad you guys feel off the wagon because lately my last radios have been buying are transistor sets
.
Sincerely Richard
P.S. I do want to slowly expand my radio collect and I found Sony had made some wonderful products in the past


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 Post subject: Re: Sony Stereo Adapter for Transistor Radios
PostPosted: Oct Sat 06, 2018 11:13 pm 
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radiorich wrote:
Sony had made some wonderful products in the past

So true and there seems to be a never ending supply of Sony products

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 Post subject: Re: Sony Stereo Adapter for Transistor Radios
PostPosted: Oct Mon 08, 2018 7:21 am 
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That is a very cool device. First I ever heard of such a thing. Does it have a stereo amp, or is the radio amp still used? It seems if the radio amp was still used the routing of the signal from the radio to the adapter, and the right channel signal back to the radio amp, which means the radio amp must be disconnected from the mono radio signal, would be too complicated to pull off.

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 Post subject: Re: Sony Stereo Adapter for Transistor Radios
PostPosted: Oct Mon 08, 2018 12:51 pm 
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The adaptor (I always thought "adapter was the correct spelling) gets the demodulated composite (MPX) FM signal from the radio then decodes this signal into the L and R channels. The L channel stays in the unit and drives its amp and speaker. The R channel is routed back into the radio through its audio input (AUX) jack which uses the amp and speaker in the radio. The AUX jack, which can also be used as a phono or tape input, disconnects the radio's mono audio. When the adaptor is switched to "Mono", the main L+R audio (part of the composite signal) is routed to both amps and speakers.

Dave


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 Post subject: Re: Sony Stereo Adapter for Transistor Radios
PostPosted: Oct Mon 08, 2018 4:31 pm 
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Okay, so the AUX input is probably on the radio for use with the stereo adaptor more than any other reason. Does the volume control on the adaptor control both, or do you need to adjust both the volume control on the radio and the adaptor? It seems that if the adaptor can be used with various models, in some cases there might be a difference between the two amps output wattage that would be a problem if there was no balance control.

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 Post subject: Re: Sony Stereo Adapter for Transistor Radios
PostPosted: Oct Mon 08, 2018 8:45 pm 
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The volume control on the adaptor is for the left channel while the volume control on the radio adjusts the right channel. Proper "balance" is derived using these controls as is the case with some stereo hi fi amps that have two volume controls and no balance control. (These are often "ganged" but can be adjusted individually.) If there is a difference in wattage, it would only be apparent if used at high volume levels when the lower power unit distorts the sound sooner than the higher power unit. Admittedly, the adaptor accessory is kind of a gimmick.

Dave


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 Post subject: Re: Sony Stereo Adapter for Transistor Radios
PostPosted: Oct Mon 08, 2018 9:12 pm 
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Quote:
Admittedly, the adaptor accessory is kind of a gimmick.


I think that a lot of gimmick pieces are today some of the coolest things made back then. The other factor is that most are pretty rare.

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