KB Pup. AC version - UK Vintage Radio Repair and Restoration Discussion Forum

retroaudio · 23rd Nov 2008, 11:31 pm

Hi I have acquired one of these and was looking for some general advice

1) What would be a good replacement speaker cloth in keeping with the radio

2) there are input sockets up each side 4 up one side on a paxolin strip with a wander plug. two on the other. The 4 appear to govern wave change but I am unsure if I am using the set correctly.

3) does anyone have a circuit diagram of the AC version

Thanks Alex

Brian R Pateman · 24th Nov 2008, 6:57 am

Sid Chaplin is probably the best source for replacement speaker cloth. The cloth on my "New Pup" is plain with a fairly open weave (and not in very good condition).

Is this the model 397A?

If so it is the "New Pup" and Paul Stenning has the manual available for £1.99 from the link at the top of the page.

The sockets on the side are for aerial connection and allow for different sensitivity depending on the length of aerial and signal strength available.

Regards,

FRANK.C · 24th Nov 2008, 8:38 pm

Hi Alex
If its the older AC pup, two valve + rectifier, speaker to front with speaker adjustment in middle and tuning and reaction knobs on top. See this tread. https://www.vintage-radio.net/forum/...&highlight=pup

With the help of Ed Dinning and Jim Beacon I have drawn the circuit.
PM me with your e-mail address if its any good to you.

Frank

Ed_Dinning · 24th Nov 2008, 9:27 pm

Hi Alex, I have the bits for one of these, minus the power supply, so any pictures you could post would be much appreciated.
The tuning and reaction caps on mine needed stripping and re-building ( a fiddly job) to get them to work properly. The same fault was present on one that a pal of mine had.
Another thing to watch out for is poor contacts on the valve holders. This set was built down to a price and corrosion can get in everywhere; nevertheless a simple circuit that should be easy to get working and give reasonable local station results.

Ed

23rd Nov 2008, 11:31 pm	#1
retroaudio Pentode Join Date: Mar 2005 Location: Cairneyhill, Fife, UK. Posts: 135	KB Pup. AC version Hi I have acquired one of these and was looking for some general advice 1) What would be a good replacement speaker cloth in keeping with the radio 2) there are input sockets up each side 4 up one side on a paxolin strip with a wander plug. two on the other. The 4 appear to govern wave change but I am unsure if I am using the set correctly. 3) does anyone have a circuit diagram of the AC version Thanks Alex

24th Nov 2008, 6:57 am	#2
Brian R Pateman Nonode Join Date: Jun 2005 Location: Western Lake District, Cumbria (CA20) - UK Posts: 2,136	Re: KB Pup. AC version Sid Chaplin is probably the best source for replacement speaker cloth. The cloth on my "New Pup" is plain with a fairly open weave (and not in very good condition). Is this the model 397A? If so it is the "New Pup" and Paul Stenning has the manual available for £1.99 from the link at the top of the page. The sockets on the side are for aerial connection and allow for different sensitivity depending on the length of aerial and signal strength available. Regards, __________________ Brian

24th Nov 2008, 8:38 pm	#3
FRANK.C Heptode Join Date: Feb 2006 Location: Roscommon, Ireland Posts: 732	Re: KB Pup. AC version Hi Alex If its the older AC pup, two valve + rectifier, speaker to front with speaker adjustment in middle and tuning and reaction knobs on top. See this tread. https://www.vintage-radio.net/forum/...&highlight=pup With the help of Ed Dinning and Jim Beacon I have drawn the circuit. PM me with your e-mail address if its any good to you. Frank

24th Nov 2008, 9:27 pm	#4
Ed_Dinning Dekatron Join Date: Jan 2004 Location: Newcastle upon Tyne, Tyne & Wear, UK. Posts: 8,195	Re: KB Pup. AC version Hi Alex, I have the bits for one of these, minus the power supply, so any pictures you could post would be much appreciated. The tuning and reaction caps on mine needed stripping and re-building ( a fiddly job) to get them to work properly. The same fault was present on one that a pal of mine had. Another thing to watch out for is poor contacts on the valve holders. This set was built down to a price and corrosion can get in everywhere; nevertheless a simple circuit that should be easy to get working and give reasonable local station results. Ed