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Old 15th Sep 2023, 10:45 am   #1
mediaseller
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Default Solid State 9 2 Wave Band - Satellite Electronics LTD

Hi.

I am restoring one of these currently, and can't find a circuit diagram anywhere.

I've tried www.service-data.com and radio museum.

Can anyone help, please?

Thanks in anticipation.
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Old 15th Sep 2023, 10:59 am   #2
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Default Re: Solid State 9 2 Wave Band - Satellite Electronics LTD

It looks like a pretty typical late 60s Hong Kong no-name radio. I doubt if you'll find service data for it, but it's likely to be a standard conservative superhet design. The audio output stage is clearly transformer coupled.

I actually think it looks quite attractive in a cheap 'n' cheerful sort of way.
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Old 15th Sep 2023, 11:25 am   #3
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Default Re: Solid State 9 2 Wave Band - Satellite Electronics LTD

Further to Paul's reply, the schematic won't be a million miles different from this typical 6 PNP transistor, -9 volt supply rail, Far Eastern, 1960s set.
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Old 15th Sep 2023, 11:58 am   #4
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Default Re: Solid State 9 2 Wave Band - Satellite Electronics LTD

The OP's set looks as if it may use silicon NPN transistors with a +ve supply rail - easy enough to work out anyway. It's post 1967 and pre 1978, probably around 1970.
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Old 15th Sep 2023, 1:56 pm   #5
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Default Re: Solid State 9 2 Wave Band - Satellite Electronics LTD

Quote:
Originally Posted by paulsherwin View Post
The OP's set looks as if it may use silicon NPN transistors with a +ve supply rail - easy enough to work out anyway. It's post 1967 and pre 1978, probably around 1970.
Hi.

Thanks. Yes, they are silicon pudding bowl transistors.
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Old 15th Sep 2023, 1:57 pm   #6
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Default Re: Solid State 9 2 Wave Band - Satellite Electronics LTD

Quote:
Originally Posted by Graham G3ZVT View Post
Further to Paul's reply, the schematic won't be a million miles different from this typical 6 PNP transistor, -9 volt supply rail, Far Eastern, 1960s set.
Thanks Graham.
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Old 15th Sep 2023, 1:59 pm   #7
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Default Re: Solid State 9 2 Wave Band - Satellite Electronics LTD

Quote:
Originally Posted by paulsherwin View Post
The OP's set looks as if it may use silicon NPN transistors with a +ve supply rail - easy enough to work out anyway. It's post 1967 and pre 1978, probably around 1970.
Thanks, Paul.

The variable capacitor is a bit scratchy, so I cleaned the spindle end. I'll try it out again tonight.
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Old 15th Sep 2023, 2:00 pm   #8
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Thumbs up Re: Solid State 9 2 Wave Band - Satellite Electronics LTD

Quote:
Originally Posted by Graham G3ZVT View Post
Further to Paul's reply, the schematic won't be a million miles different from this typical 6 PNP transistor, -9 volt supply rail, Far Eastern, 1960s set.
Thanks for the drawing, Graham.
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Old 15th Sep 2023, 5:10 pm   #9
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Default Re: Solid State 9 2 Wave Band - Satellite Electronics LTD

R.M. says Number of Transistors = 9. The power of suggestion.
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Old 15th Sep 2023, 5:45 pm   #10
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Default Re: Solid State 9 2 Wave Band - Satellite Electronics LTD

It may be using transistors as diodes to bump up the transistor count, a very common HK dodge in the 60s. Sometimes manufacturers just lied though.
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Old 15th Sep 2023, 5:53 pm   #11
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Default Re: Solid State 9 2 Wave Band - Satellite Electronics LTD

Yes, a transistor with B and C strapped together to work as the detector, and another similarly wired in the Base bias network of the output transistors....

Always good to bump up the transistor boast count.

At least a diode wired transistor in the output stage bias network was a serious attempt, properly done it could reduce the overall standing current in the output pair and compensate for ageing batteries where the voltage was sagging.
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Old 18th Sep 2023, 8:33 pm   #12
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Default Re: Solid State 9 2 Wave Band - Satellite Electronics LTD

Thanks all for your suggestions.

I was at least successful in the end with the help of some responders.

Replaced the tantalum cap with a parallel pair to get the right value. I went over the board, resoldering poor joints, and used contact cleaner on the VC.

After a quick basic alignment, it works well.

Thanks again.
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Old 20th Sep 2023, 10:39 am   #13
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Default Re: Solid State 9 2 Wave Band - Satellite Electronics LTD

An interesting mix of TO72, plastic and TO5(39?) transistors if nothing else!

I wonder if the solder bridge between the IF cans was a design feature or a quick fix production bodge?
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Old 20th Sep 2023, 12:03 pm   #14
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Default Re: Solid State 9 2 Wave Band - Satellite Electronics LTD

A lot of HK radios from that era used TO5/39 output transistors despite their large size, often covered with coloured plastic.
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Old 21st Sep 2023, 10:16 am   #15
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Default Re: Solid State 9 2 Wave Band - Satellite Electronics LTD

I am glad you got this radio working. Its a very attractive looking radio and a good example of what was a very popular style of small HK radio from the late 1960's.

I agree with all the comments said about the transistor count using transistors with a leg snipped as diodes typically for the detector and output bias.
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