Mullard FM tuner

[blu_glo]

About five years ago during some web trawling I happened across a Mullard article for a homebuild (!) valve (tube) FM tuner. It was straightforward mono design RF amp/osc-IF-detector stages (no stereo decoder). I would say the year was probably "nineteen sixties" and used the modern valves we are all accustomed to.

I was fascinated, and thought I had saved the file, but it seems to have since disappeared.

It was in the same format as their project articles in the famous "Mullard Tube Circuits for Audio Amplifiers" book, however the tuner project does not appear in either the originals or the reprints of the book.

I guess it could also have been a magazine article but I'm sure it was attributed to Mullard and not just because of the valves used.

Has anyone else seen this, or have a copy or link?

Thanks in advance,
Simon

 

[blu_glo]

Never mind - I found it....

 

[ejp]

Very good, I've been looking for this. Can you post a scan? A PDF of the whole thing even?

EJP

 

[blu_glo]

nope.




I'll see what I can do. It won't be quick though...

 

[ejp]

That would be great, especially a full scan. This booklet seems to be unobtainium on bookbinder.com.

 

[PRR]

If you go back to 1957 it is only 3/6d.

 

[blu_glo]

If you go back to 1957 it is only 3/6d.

Indeed, as in original photo too!

 

[lcsaszar]

Component manufacturers encouraged DIY that time. This attitude seems disappeared by now, why?

 

[blu_glo]

There were less companies and the hobbyist held a greater share of their market at the time. Nowadays you and I buying maybe 10 to 100components per project, pale to insignicance to corporations ordering in 10 to 100 million....

 

[blu_glo]

That said the hobbyist is a faster moving entity than most R&D departments and people like texas instruments and their peers seem to appreciate this

 

[paba]

Hi all,
not sure when exactly Blu-glo(Simon) was going to share that article. and I was supremely curious as I'm a big vintage tuner fan, I went hunting and found it or at least a version of the article that was later pulled into the compilation he teased us with.

enjoy!
Paba

 

[ejp]

Thanks very much. There is a correction to the coil winding data in the following issue, WW 09/1955.

 

[blu_glo]

Hi All,

Was not meant to tease! I did get them scanned in but have no proper bulk crop and paste have not had time to go through all the pages.
Cannot seem to be able to upload attachment presently

 

[blu_glo]

Its all available here....

WIRELESS WORLD: UK technical magazine 1913-2005

August 1955 - Original FM tuner article
Sept 1955 - Correction for the coil building and also original part numbers for prebuilt ones..

There also seems to be another tuner design in the April & May 1955 mags too

 

[ejp]

The 87.5-100MHz RF bandwidth makes it obsolete already, and would take quite some tweaking to fix around the aerial and oscillator coils. By modern standards the 210KHz IF bandwidth is meagre, but it would be enough to drive a decoder into about -30dB of separation. No AFC. Ratio detector plus limiter valve, so it should have good quieting.