UK Vintage Radio Repair and Restoration Powered By Google Custom Search Vintage Radio and TV Service Data

Go Back   UK Vintage Radio Repair and Restoration Discussion Forum > General Vintage Technology > Components and Circuits

Notices

Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets.

Reply
 
Thread Tools
Old 19th Apr 2021, 3:16 pm   #1
stevehertz
Dekatron
 
stevehertz's Avatar
 
Join Date: Sep 2011
Location: Rugeley, Staffordshire, UK.
Posts: 5,324
Default VT61A - Dalek valve!

Rummaging through my spares I came across this somewhat strange, 'Dalek' looking valve. Apparently it's a VT61A transmitting double triode (info from valve museum) designed for use up to 150 MHz. It was made by Rogers of Canada and carries the Air Ministry markings. The VT prefix is an Air Force designation, also on the envelope is the old stores code of 10E/142. The original VT61 is on a UX7 American base, but for the VT61A the valve is mounted on a B5 base.

This one has 'A M' and a crown above that engraved on the base. Also 10E/142b.

I was just wondering if it had any memories for anyone and if it has a use these days in vintage equipment? I wouldn't have thought so.
Attached Thumbnails
Click image for larger version

Name:	20210419_160418.jpg
Views:	245
Size:	54.6 KB
ID:	232159  
__________________
A digital radio is the latest thing, but a vintage wireless is forever..
stevehertz is online now   Reply With Quote
Old 19th Apr 2021, 3:24 pm   #2
M0FYA Andy
Nonode
 
Join Date: May 2007
Location: Preston, Lancashire, UK.
Posts: 2,218
Default Re: VT61A - Dalek valve!

Used in WW2 aircraft IFF equipment.
M0FYA Andy is offline   Reply With Quote
Old 19th Apr 2021, 3:59 pm   #3
merlinmaxwell
Dekatron
 
merlinmaxwell's Avatar
 
Join Date: Jul 2008
Location: Maidenhead, Berkshire, UK.
Posts: 10,791
Default Re: VT61A - Dalek valve!

More of the horned beast than a Dalek, just think it was things like that that won WWII for us. A forgotten history and (well I can't find one) not in any war history books.
__________________
Cats have staff, it's dogs that have owners.
merlinmaxwell is offline   Reply With Quote
Old 19th Apr 2021, 4:05 pm   #4
Hartley118
Octode
 
Hartley118's Avatar
 
Join Date: Aug 2015
Location: Cambridge, Cambs. UK.
Posts: 1,788
Default Re: VT61A - Dalek valve!

ISTR assembling an RSC 'high gain' audio amplifier kit in the 1950s which used a couple of VT61s in parallel push pull as its output stage. Rather pretty valves with those 'rabbit ears'! I believe the push-pull pair was claimed to give 5 watts of audio.

I think the amplifier also included a couple of VR65s (SP61s)

Martin
__________________
BVWS Member
Hartley118 is offline   Reply With Quote
Old 19th Apr 2021, 4:37 pm   #5
M0FYA Andy
Nonode
 
Join Date: May 2007
Location: Preston, Lancashire, UK.
Posts: 2,218
Default Re: VT61A - Dalek valve!

Not a very good picture, but two can be seen in this view of the IFF Mk2 unit.

Andy
Attached Files
File Type: pdf Chassis top view from R3002 PDW.pdf (163.8 KB, 92 views)
M0FYA Andy is offline   Reply With Quote
Old 20th Apr 2021, 8:35 am   #6
Bill
Pentode
 
Join Date: Dec 2005
Location: Denton, Manchester, UK.
Posts: 117
Default Re: VT61A - Dalek valve!

Had some NOS similar to these, half a century ago, 2C34 or RK34. I built a PP amp using one, which worked but not very well. A better approach to amp design might prove interesting.
Bill is offline   Reply With Quote
Old 20th Apr 2021, 7:12 pm   #7
G6Tanuki
Dekatron
 
G6Tanuki's Avatar
 
Join Date: Apr 2012
Location: Wiltshire, UK.
Posts: 9,983
Default Re: VT61A - Dalek valve!

They fitted into the same technical-space as the similar-era CV6/CV1135/CV2920/DET20/VR135 which was used in the WS19 "B-set" superregen transceiver around 220MHz - it was essentially a 6J5 triode with the grid and anode brought-out to top-caps to make their involvement in VHF tuned-circuits a bit easier.

The VT61A would have been ideal for use in a 'tuned lines' push-pull low-power VHF transmitter circuit.
G6Tanuki is offline   Reply With Quote
Reply

Thread Tools



All times are GMT. The time now is 10:17 pm.


All information and advice on this forum is subject to the WARNING AND DISCLAIMER located at https://www.vintage-radio.net/rules.html.
Failure to heed this warning may result in death or serious injury to yourself and/or others.


Powered by vBulletin®
Copyright ©2000 - 2021, vBulletin Solutions, Inc.
Copyright ©2002 - 2021, Paul Stenning.