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Vintage Radio (domestic) Domestic vintage radio (wireless) receivers only. |
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10th Dec 2018, 7:49 pm | #1 |
Heptode
Join Date: Mar 2014
Location: Meath, Ireland
Posts: 547
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Pocket transistor id please.
Picked this up today from a second hand store while on my break. Anyone recognise it?
John Joe. |
10th Dec 2018, 7:55 pm | #2 |
Dekatron
Join Date: Apr 2012
Location: Wiltshire, UK.
Posts: 13,953
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Re: Pocket transistor id please.
The tin-cased 'lozenge' shaped transistors suggest they're Newmarket - which will have "NKT" part-numbers.
This in turn hints at an early-sixties UK manufacturer (I don't recall NKT transistors being exported to Hong Kong etc. for fitment into "empire made" radios] |
10th Dec 2018, 7:58 pm | #3 |
Nonode
Join Date: Mar 2010
Location: Dukinfield, Cheshire, UK.
Posts: 2,034
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Re: Pocket transistor id please.
I can't help, but it sure is a pretty thing. The styling is plain but attractive, something I always like. The only thing I recognise is the Newmarket transistors.
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Andy G1HBE. |
10th Dec 2018, 8:53 pm | #4 |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
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Re: Pocket transistor id please.
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10th Dec 2018, 9:13 pm | #5 |
Heptode
Join Date: Mar 2014
Location: Meath, Ireland
Posts: 547
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Re: Pocket transistor id please.
Hi lads, thanks for chipping in. I did think it was of British manufacture because of the license plate inside the back cover.
There seems to be an odd bit of grill stuck in a small square recess on the front, perhaps originally the was a makers plate or mark here Yes Andrew, I do like it's styling. Very simple and it's in great cosmetic nick too. It seems to take 3 N size batteries. Regards, John Joe. |
10th Dec 2018, 9:18 pm | #6 | |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
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Re: Pocket transistor id please.
Quote:
Lawrence. |
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10th Dec 2018, 10:45 pm | #7 |
Heptode
Join Date: Mar 2014
Location: Meath, Ireland
Posts: 547
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Re: Pocket transistor id please.
Hi Lawrence, phone froze while I was replying earlier. Thanks for the id.
John Joe. |
11th Dec 2018, 6:05 am | #8 |
Dekatron
Join Date: Jun 2015
Location: Biggin Hill, London, UK.
Posts: 5,191
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Re: Pocket transistor id please.
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11th Dec 2018, 8:11 am | #9 |
Nonode
Join Date: Jul 2005
Location: Hull, East Yorkshire, UK.
Posts: 2,083
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Re: Pocket transistor id please.
Three N cells? Excuse me, but could you buy these nowadays?
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11th Dec 2018, 8:53 am | #10 |
Dekatron
Join Date: Apr 2012
Location: Worksop, Nottinghamshire, UK.
Posts: 5,549
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Re: Pocket transistor id please.
N cells?
NiMh would be easiest to get these days. |
11th Dec 2018, 9:29 am | #11 | |
Hexode
Join Date: Sep 2003
Location: Cheltenham, Gloucestershire, UK.
Posts: 298
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Re: Pocket transistor id please.
Quote:
dave
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Dave Teague |
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11th Dec 2018, 9:33 am | #12 |
Banned
Join Date: Dec 2013
Location: Middlewich, Cheshire, UK. & Winter in the Philippines.
Posts: 3,897
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Re: Pocket transistor id please.
N cell, Lady battery, LR1. Used commonly in fish bite alarms. Door remotes, etc.
Still widely available, even on Amazon. Other suppliers are available, see ebay for reliable GP ones. |
11th Dec 2018, 9:35 am | #13 |
Heptode
Join Date: Apr 2003
Location: Ayr, Ayrshire, UK.
Posts: 630
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Re: Pocket transistor id please.
'N' size alkaline cells are available from CPC :-https://cpc.farnell.com/w/c/electric...ry-size-code=n
and probably other places too. |
11th Dec 2018, 11:35 am | #14 |
Dekatron
Join Date: Mar 2005
Location: Gateshead, Tyne and Wear, UK.
Posts: 7,444
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Re: Pocket transistor id please.
Note the early employment of the miniature Toko type IF transformers.
DFWB. |
11th Dec 2018, 3:21 pm | #15 |
Nonode
Join Date: Mar 2010
Location: Dukinfield, Cheshire, UK.
Posts: 2,034
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Re: Pocket transistor id please.
A bit off-topic, but there's a good little story about IF transformers in (I think) the 3rd edition of Radio Radio.
It comes from one of the designers of the PAM 710 transistor radio. He said that because of the rather poor performance of early transistors, it was important to get maximum power transfer between the stages in the RF and IF strips. He was in charge of the in-house design of the IF transformers and went to great lengths to optimise the magnetic circuits and carefully manage the Q etc, even specifying brass pins to reduce any disruption of the magnetic properties. However, when the production guys got hold of it they used standard steel pins which protruded into the magnetic parts, completely ruining the gain/bw performance. Rather than go back to the original design, they reduced the IF to 120 kc/s to get the performance back. It must have suffered from some pretty bad images!
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Andy G1HBE. Last edited by Andrew2; 11th Dec 2018 at 3:29 pm. |
11th Dec 2018, 5:05 pm | #16 |
Pentode
Join Date: Jul 2013
Location: Wilmslow, Cheshire, UK.
Posts: 209
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Re: Pocket transistor id please.
Newmarket was a Pye company later taken over by GE.Their earlier transistors were designated V/10,V/30 etc later changing to NKT.It would be interesting to know which types are fitted as this might give a close date of manufacture.I have an booklet of application notes dated October 1959 and all the transistors in it are the V/ series.Peter.
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11th Dec 2018, 5:21 pm | #17 |
Octode
Join Date: Aug 2008
Location: Rotherham, South Yorkshire, UK.
Posts: 1,701
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Re: Pocket transistor id please.
Morrisons definitely sells a Duracell packet of 2 N cells for around £3.50 I think.
Peter |
13th Dec 2018, 8:02 pm | #18 |
Heptode
Join Date: Mar 2014
Location: Meath, Ireland
Posts: 547
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Re: Pocket transistor id please.
Yesterday I obtained 3 N cells from Dealz (Poundland in Ireland) so last night I decided to have a go at getting this working. I replaced the electrolytics, as they were all showing signs of leakage.
I then cleaned the volume pot and wave change switch with servisol. It brings in Radio 4 on the light preset quite well and medium wave is quite sensitive. Sadly the little lugs on the back are worn so the back cover fitting isn't as tight as it could be, but for 55 years plus it's in remarkable condition. I expect the N cells, being alkalines, will last a long time. Cheers, John Joe. |