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Old 5th Apr 2011, 10:49 am   #1
LeakyGrid
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Default Simple TRF Set

My digging about in the attic has turned up this little TRF set that I built over 40 years ago. It has a 9D6 RF stage and an ECC82 double-triode serving as leaky grid detector and output stage. The coils are Denco maxi-Q miniature plug- ins, mounted in the cans they were supplied in. The design came from the 3rd edition of the RSGB Amateur Radio Handbook.

The main tuning capacitor and the reaction capacitor are mounted on a sub-panel to allow slow motion drives to be fitted. The capacitor for the separately-tuned RF stage is below the chassis.

Unfortunately the power supply is missing, and I remember lending it to someone with whom I have completely lost touch; I can’t even remember his surname. Also, I seem to have had a go at the audio stages at some time, adding an extra valve; I can’t remember why.

At the moment it’s sitting on the bookshelf while I decide what to do with it. I’m supposed to be having a clear out.J

Roger
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Old 5th Apr 2011, 11:45 am   #2
Skywave
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Thumbs up Re: Simple TRF Set

Ah-Ha! I recognise that! It's the 1-V-1 design from the RSGB handbook, 3rd. edition, p.108; original design by G8TL. The PSU requirement is stated as 6v. @ 1 amp.; 250v @ 30 mA.

Al. / Skywave
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Old 5th Apr 2011, 7:04 pm   #3
ParcGwyn
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Default Re: Simple TRF Set

Is that a Jason FM tuner sat next to it?


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Old 5th Apr 2011, 9:57 pm   #4
LeakyGrid
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Default Re: Simple TRF Set

Quote:
Is that a Jason FM tuner sat next to it?
It's a mono Leak Troughline. This was the first FM tuner I ever owned, bought second hand for 12. I think it's the Mk I. The colour is actually a light golden brown.

Roger
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Old 6th Apr 2011, 7:11 pm   #5
ParcGwyn
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Default Re: Simple TRF Set

Very nice tuner, I have a later mono troughline that is awaiting repair.

Dave
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Old 7th Apr 2011, 9:17 pm   #6
LeakyGrid
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Default Re: Simple TRF Set

Quote:
It's the 1-V-1 design from the RSGB handbook, 3rd. edition, p.108
That's the one; I have the 1964 reprint. It performed well on top-band CW, but with everyone moving to SSB it became less useful for SW listening.

Roger
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