Simple TRF Set - UK Vintage Radio Repair and Restoration Discussion Forum

LeakyGrid · 5th Apr 2011, 10:49 am

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

Skywave · 5th Apr 2011, 11:45 am

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

ParcGwyn · 5th Apr 2011, 7:04 pm

Is that a Jason FM tuner sat next to it?

Dave
GW7ONS
www.parcgwyn.talktalk.net

LeakyGrid · 5th Apr 2011, 9:57 pm

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

ParcGwyn · 6th Apr 2011, 7:11 pm

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

Dave

LeakyGrid · 7th Apr 2011, 9:17 pm

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

5th Apr 2011, 10:49 am	#1
LeakyGrid Rest in Peace Join Date: Jan 2006 Location: Chandlers Ford Hampshire Posts: 144	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 Attached Thumbnails

5th Apr 2011, 11:45 am	#2
Skywave Rest in Peace Join Date: Jun 2006 Location: Chard, South Somerset, UK. Posts: 7,457	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

5th Apr 2011, 7:04 pm	#3
ParcGwyn Hexode Join Date: Jun 2005 Location: Aberystwyth, Wales, UK. Posts: 358	Re: Simple TRF Set Is that a Jason FM tuner sat next to it? Dave GW7ONS www.parcgwyn.talktalk.net

6th Apr 2011, 7:11 pm	#5
ParcGwyn Hexode Join Date: Jun 2005 Location: Aberystwyth, Wales, UK. Posts: 358	Re: Simple TRF Set Very nice tuner, I have a later mono troughline that is awaiting repair. Dave