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 Post subject: Re: Transistor radio kit
PostPosted: Jul Wed 23, 2014 11:35 pm 
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Location: Vieques,PR 00765 USA
The Mouser scheme which matched this one and probably most modern imported sets was:
Osc - Red
1st - Yellow 60k>600 (looks orange in the photo)
2nd - White 30k>500
3rd - Blk - 20k>6k

My straggler which went in as 3rd was green. I didn't take any DC resistance measurements.

Did I mention the precut leads for the battery connectors weren't long enough?

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Last edited by Bill M on Jul Wed 23, 2014 11:51 pm, edited 1 time in total.

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 Post subject: Re: Transistor radio kit
PostPosted: Jul Wed 23, 2014 11:50 pm 
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Location: SoCal, 91387
Thanks, I never really knew which was which, although thinking about it, could have traced a print and compared it to the board placement of each via their printed wiring.

Yellow and white seem to be universal, but the third IF color can be black as Mouser suggested, green as you received, and I've often seen blue as well.

How come you soldered the power leads to the battery? OK, just re-read it. So why not just add your own hook-up leads to the battery connectors?

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 Post subject: Re: Transistor radio kit
PostPosted: Jul Thu 24, 2014 1:38 am 
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Location: Vieques,PR 00765 USA
Yes, Richard, I obviously will do so.

For posterity here are good scans of the documentation.

http://www.sparkbench.com/chineseradio3_zx921.jpg

http://www.sparkbench.com/chineseradio4_zx921.jpg

This particular radio goes under both names as X-921 and ZX-921 and is sold by dozens if not hundreds of Chinese vendors on the internet and apparently has been around for a few years. Alibaba.com pimps many of them. Its clearly an adjunct to a learning course. I did find a text that supposedly addressed this radio as course material but it was all in Chinese.

I think this is a much better radio than the AM/FM kit I bought earlier.

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 Post subject: Re: Transistor radio kit
PostPosted: Jul Thu 24, 2014 6:20 am 
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Well Bill, didn't you always want to learn Chinese anyways?

Once you pick some up, just think what a hit you'll be the next time you order in a Chinese restaurant! :wink:

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 Post subject: Re: Transistor radio kit
PostPosted: Jul Thu 24, 2014 10:47 pm 
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Location: Vieques,PR 00765 USA
I pull out my Spanish when I go out to Mexican restaurants in the States. They always get a kick out of that. Of course I'm not too good on the receiving end of the Mexican dialect.

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 Post subject: Re: Transistor radio kit
PostPosted: Feb Sun 25, 2018 3:33 am 
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Joined: Feb Tue 03, 2015 5:45 pm
Posts: 19
Hi Mr. Bill,
I have just ordered this kit, seeing it's special design like dual coil, 8 transistors and just 1.5v supply.
I plan to use a AA to D converter.

Could you please tell me about the performance of the kit?
Like does it do well with 1.5v?

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 Post subject: Re: Transistor radio kit
PostPosted: Mar Sat 10, 2018 5:04 pm 
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Joined: Feb Fri 09, 2018 6:44 pm
Posts: 25
This is a kit I have ordered from China. I have not received it yet.
It appears to be very similar to the 1960 radios other than it used Si rather that Ge transistors. It is listed as 7 transitions but one is used as a detector diode.
I have included an updated manual and schematic corrections are in red. This radio can be found on eBay for around $6.50 Canadian.

Looking forward to building this.


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 Post subject: Re: Transistor radio kit
PostPosted: Mar Thu 22, 2018 9:26 am 
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Location: Rayleigh, BC, CANADA
I have purchased these in the past specifically for the parts, you can't beat the price.

I have encountered the odd radio with an open winding in the audio transformer or scratchy tuner, the vol. controls and if coils are pretty much standard as well and make excellent replacements.

Maybe one day I will actually assemble one of these with spare parts.


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 Post subject: Re: Transistor radio kit
PostPosted: Mar Thu 22, 2018 6:51 pm 
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Rocco53 wrote:
I have purchased these in the past specifically for the parts, you can't beat the price.

I have encountered the odd radio with an open winding in the audio transformer or scratchy tuner,

Regardless of how low the price may be, if there is a sub standard component, contact the seller and complain. They'll either send you a replacement part, or possibly an entire kit.

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 Post subject: Re: Transistor radio kit
PostPosted: Mar Sat 24, 2018 11:35 am 
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fifties wrote:
Rocco53 wrote:
I have purchased these in the past specifically for the parts, you can't beat the price.

I have encountered the odd radio with an open winding in the audio transformer or scratchy tuner,

Regardless of how low the price may be, if there is a sub standard component, contact the seller and complain. They'll either send you a replacement part, or possibly an entire kit.

I was talking about when I restore my vintage transistor sets I use parts from these kits.

I Never received a defective one from the ebay seller.

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 Post subject: Re: Transistor radio kit
PostPosted: Mar Sat 24, 2018 7:24 pm 
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Rocco53 wrote:
fifties wrote:
Rocco53 wrote:
I have purchased these in the past specifically for the parts, you can't beat the price.

I have encountered the odd radio with an open winding in the audio transformer or scratchy tuner,

Regardless of how low the price may be, if there is a sub standard component, contact the seller and complain. They'll either send you a replacement part, or possibly an entire kit.

I was talking about when I restore my vintage transistor sets I use parts from these kits.

I Never received a defective one from the ebay seller.

OK, I misunderstood. Actually I've found Transistor sets to be pretty reliable hombres, once the (usually 4) Electrolytic's have been replaced. The only part that might normally need replacement otherwise is the VC; they often have a dead spot in the first quarter turn, or they can be wobbly from usage.

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 Post subject: Re: Transistor radio kit
PostPosted: Mar Fri 30, 2018 2:14 am 
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Joined: Jun Tue 21, 2011 8:27 pm
Posts: 3245
Location: Flint Hill, Virginia
Bought and built one of these radios five or six years ago when I rekindled my interest in portable radios. Had a couple of hiccups in the assembly but finally got it working pretty good. Not a DX machine, but fun project.

Dig that red color and the StarTrek design on the speaker.

Mitch


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