[ARC5] "ARC-5" Receivers and "Q" multipliers

[Ian Wilson]

Hi Peter,

The 6021 is readily available - NOS on eBay for about $10, or much cheaper
if one is prepared to dig through large boxes of submini tubes from
swapmeets,
etc (more fun if you have the time).

I would like a copy of the scanned page. Perhaps that would motivate me to
dig out the 19 Set from the garage!

Groetjes,

--ian


On Tue, Aug 11, 2015 at 2:25 PM, Peter Eijlander (PA0PJE) <pa0pje at xs4all.nl>
wrote:

> I have made a simple Q multiplier in a WS19 with a subminiature
> twin-triode 6021WA, which I got once from someone who worked in radar
> maintenance. It laid unused for years 'till I found a simple circuit in the
> Radio Communications Handbook of the RSGB. I swapped the B-set tuning cap
> for a beautiful Bourns WW-pot from the same source. Works very smooth, can
> be set very close to oscillation and enhances selectivity much.
>
> I made a scan of the page of the book. If you are interested I can send
> the .pdf. I don't know how easy or difficult it is to get this 6021
> miniature tube.
>
> 73,
> Peter - PA0PJE
>
> Op 2015-08-11 17:17 schreef Phillip Carpenter:
>
>> There was an article in QST probably around the summer of 1961 for a
>>> Command Set
>>> >>receiver Q-multiplier.  Used only a pot and a gimmick.  Worked pretty
>>> well.
>>> >>Took some ingenuity to get the pot shoehorned into the plug-in front
>>> box,
>>> >>though.
>>>
>>> I've used that one: it works fairly well in the 6 - 9.1 MHz receivers,
>>> not so well
>>> in the 3 - 6, and not worth doing in the MF jobs. What it actually does
>>> is to
>>> make the first IF regenerative. It works pretty well when the signals
>>> are weak,
>>> but as the signal levels rise, it gets less effective.
>>>
>>> Even so, a REAL "Q" multiplier works a lot better.
>>>
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