Marconiphone P20B - UK Vintage Radio Repair and Restoration Discussion Forum

25th Apr 2011, 5:38 pm

Hi all,

I have just 'won' one of these on eBay, one technical question, why is the IF at 365kHz not in the normal 465kHz regeion?

MM

Leon Crampin · 25th Apr 2011, 6:54 pm

Possibly to give more gain as these sets operate at a fairly low HT voltage.

EMI did some strange things though.

Leon.

Brian R Pateman · 26th Apr 2011, 12:31 pm

These use a Plessey chassis so it's a little unfaair to accuse EMI of doing strange thins in this case.

That said I think that the chance to get a little more gain with low HT was the reason for the choice of a lower IF.

They are a nice little set and give a fairly good account of themselves considering their size.

29th Apr 2011, 7:35 am

She hs turned up, quite tatty but complete. Put in my B114 from the P17B and it worked, I only tried for a few seconds just in case. Given it's tattyness including a great big fag burn on the top I think it will be a fill, rub down, respray and new snakeskin job. What colour should I use, a girly pink, manly blue or something else?

29th Apr 2011, 8:51 am

What to do with this, the fag burn, it is quite deep. I need ivory epoxy filler if I am not going to spray paint it, any ideas?

25th Apr 2011, 5:38 pm	#1
Guest Guest Posts: n/a	Marconiphone P20B Hi all, I have just 'won' one of these on eBay, one technical question, why is the IF at 365kHz not in the normal 465kHz regeion? MM

25th Apr 2011, 6:54 pm	#2
Leon Crampin Octode Join Date: Nov 2005 Location: Surrey, UK. Posts: 1,874	Re: Marconiphone P20B Possibly to give more gain as these sets operate at a fairly low HT voltage. EMI did some strange things though. Leon.

26th Apr 2011, 12:31 pm	#3
Brian R Pateman Nonode Join Date: Jun 2005 Location: Western Lake District, Cumbria (CA20) - UK Posts: 2,136	Re: Marconiphone P20B These use a Plessey chassis so it's a little unfaair to accuse EMI of doing strange thins in this case. That said I think that the chance to get a little more gain with low HT was the reason for the choice of a lower IF. They are a nice little set and give a fairly good account of themselves considering their size. __________________ Brian

29th Apr 2011, 7:35 am	#4
Guest Guest Posts: n/a	Re: Marconiphone P20B She hs turned up, quite tatty but complete. Put in my B114 from the P17B and it worked, I only tried for a few seconds just in case. Given it's tattyness including a great big fag burn on the top I think it will be a fill, rub down, respray and new snakeskin job. What colour should I use, a girly pink, manly blue or something else?

29th Apr 2011, 8:51 am	#5
Guest Guest Posts: n/a	Re: Marconiphone P20B What to do with this, the fag burn, it is quite deep. I need ivory epoxy filler if I am not going to spray paint it, any ideas? Attached Thumbnails