General Discussion

Forum home - Go back to General discussion

Identifying a barn find kit radio
« Back · 1 · Next »
Return to top of page · Post #: 1 · Written at 12:35:15 PM on 6 July 2020.
	Ian Robertson Location: Belrose, NSW Member since 31 December 2015 Member #: 1844 Postcount: 2444
This little home-made mantle radio might be a Little General (late 40's components, EFCO dial) but the circuit seems a bit too low rent. ECH33 mix/osc, cathode biassed no AGC RCS coils A single RCS IF transformer 6J7G anode bend detector Passive volume control fed from the plate of the 6J7 6V6, cathode bias. MSP 5" PM speaker 5Y3 Filter choke This thing probably doesn't need pictures but I will post some when I get a chance. Sound familiar to anyone?

Return to top of page · Post #: 2 · Written at 2:27:54 PM on 6 July 2020.
	Johnny Location: Hobart, TAS Member since 31 July 2016 Member #: 1959 Postcount: 561
Little or Big Jim. Radio TV and hobbies? JJ

Return to top of page · Post #: 3 · Written at 2:57:00 PM on 6 July 2020.
	Ian Robertson Location: Belrose, NSW Member since 31 December 2015 Member #: 1844 Postcount: 2444
Ah yes, that's right, there was a "Little Jim" series in R&H. I had a good collection of R&H once but it was lost in a flood caused by a blocked stormwater drain. This particular radio could have been SO much better with a little more design thought. I am very tempted to modify it.... The design of this is reminiscent of a radio R&H did in the early 50s that used (from memory) a 6BE6, 12AX7 and a 6X4. The twin triode was a regenerative detector and output stage. Single IFT with a tickler coil added for the regen. They did a reprise the following month using a 6AB8 / ECL80.

Return to top of page · Post #: 4 · Written at 4:32:13 PM on 6 July 2020.
	Marcc Location: Wangaratta, VIC Member since 21 February 2009 Member #: 438 Postcount: 5348
Visitors arriving but somewhere in an A4 file, I should have circuits for most "Little Jim's" & others

Return to top of page · Post #: 5 · Written at 8:00:21 PM on 6 July 2020.
	Ian Robertson Location: Belrose, NSW Member since 31 December 2015 Member #: 1844 Postcount: 2444
Yes Marc that would be appreciated. If it is an actual Little Jim then I'd be more likely to leave it as it is (and try to find out what the reasoning for such a dull design was....)

Return to top of page · Post #: 6 · Written at 3:19:35 PM on 7 July 2020.
	Gandhn Location: Cameron Park, NSW Member since 5 November 2010 Member #: 770 Postcount: 403
I have just spent a pleasant couple of hours searching through the RTV&H index and the CD of all issues, looking at all Little Jim and Little General radios and did not see anything resembling the components in Ian's post. Little Jims were all battery sets and just 1 or 2 valves, some with reaction. Little Generals were all standard superhets, using 2 X IF transformers, and none of the valves mentioned except 6V6. Harold

Return to top of page · Post #: 7 · Written at 7:49:24 PM on 7 July 2020.
	Ian Robertson Location: Belrose, NSW Member since 31 December 2015 Member #: 1844 Postcount: 2444
Thanks VERY much Harold. I don't recall seeing such a dumb (should I say "deaf") design. I'm happy it;s been confirmed. Looks like it would have the sensitivity of a crystal set and a THD figure approaching 50% on modern AM transmitters. I won't feel bad about improving it.

« Back · 1 · Next »
You need to be a member to post comments on this forum.

General Discussion

Sign In