Valve functional equivalents - UK Vintage Radio Repair and Restoration Discussion Forum

GMB · 11th Oct 2004, 9:55 am

Valve equivalent lists nomally list valves that are pin and functionally compatible. But I recently heard that some modern valves may actually be more or less the same as older versions.

Does anyone know of any lists of equivalents that are NOT pin compatible but are compatible at the characteristic level. Or perhps of near equivalents, e.g. where the heater is different (of course you can often guess these - but it seems not always correctly).

Station X · 11th Oct 2004, 11:29 am

Go to http://hereford.ampr.org/cgi-bin/tube

Look up a valve and then scroll to the bottom of the page and click on the " Same Chars " box. A whole load of electrically equivalent valves will be listed.

I have never tried this in anger, so I don't know how good it is.

Graham

GMB · 11th Oct 2004, 11:58 am

Quote:

Look up a valve and then scroll to the bottom of the page and click on the " Same Chars " box. A whole load of electrically equivalent valves will be listed.

Thanks for that link - but I don't think this site is actually doing that. It looks to me like it is simply listing other valves that are broadly the same generic type (e.g. other pentodes).

Ed_Dinning · 11th Oct 2004, 12:28 pm

Hi Gents the 50's and 60's Wireless World valve data book does this for you very well as the details are listed in tabular form by heater volts and is easy to scan. There must be many copys of this A4 size booklet about unless someone has scanned it to CD.
Ed

Norm_Leal · 11th Oct 2004, 6:33 pm

Hi

Here is something that just came up on another forum which might be useful.

http://antiqueradios.com/forums/Foru...ML/003921.html

Norm

jim_beacon · 11th Oct 2004, 7:29 pm

The Mullard maintainance manual gives lots of alternatives with base / component changes, though you have to work backwards to get it!

Jim.

Paul Stenning · 6th Mar 2005, 11:39 am

Quote:

Originally Posted by Ed_Dinning

Hi Gents the 50's and 60's Wireless World valve data book does this for you very well as the details are listed in tabular form by heater volts and is easy to scan. There must be many copys of this A4 size booklet about unless someone has scanned it to CD.
Ed

It is on my Valve Data CD-ROM - see http://www.service-data.com/cd-roms/...data/index.htm

11th Oct 2004, 9:55 am	#1
GMB Dekatron Join Date: Aug 2003 Location: near Reading (and sometimes Torquay) Posts: 3,099	Valve functional equivalents Valve equivalent lists nomally list valves that are pin and functionally compatible. But I recently heard that some modern valves may actually be more or less the same as older versions. Does anyone know of any lists of equivalents that are NOT pin compatible but are compatible at the characteristic level. Or perhps of near equivalents, e.g. where the heater is different (of course you can often guess these - but it seems not always correctly).

11th Oct 2004, 11:29 am	#2
Station X Moderator Join Date: Jan 2003 Location: Ipswich, Suffolk, IP4, UK. Posts: 21,289	Re: Valve functional equivalents Go to http://hereford.ampr.org/cgi-bin/tube Look up a valve and then scroll to the bottom of the page and click on the " Same Chars " box. A whole load of electrically equivalent valves will be listed. I have never tried this in anger, so I don't know how good it is. Graham __________________ Graham. Forum Moderator Reach for your meter before you reach for your soldering iron.

11th Oct 2004, 12:28 pm	#4
Ed_Dinning Dekatron Join Date: Jan 2004 Location: Newcastle upon Tyne, Tyne & Wear, UK. Posts: 8,195	Re: Valve functional equivalents Hi Gents the 50's and 60's Wireless World valve data book does this for you very well as the details are listed in tabular form by heater volts and is easy to scan. There must be many copys of this A4 size booklet about unless someone has scanned it to CD. Ed

11th Oct 2004, 6:33 pm	#5
Norm_Leal Retired Dormant Member Join Date: Jan 2003 Location: Livermore, California, USA. Posts: 139	Re: Valve functional equivalents Hi Here is something that just came up on another forum which might be useful. http://antiqueradios.com/forums/Foru...ML/003921.html Norm

11th Oct 2004, 7:29 pm	#6
jim_beacon Retired Dormant Member Join Date: Mar 2003 Location: Bishop's Waltham, Hants, UK. Posts: 939	Re: Valve functional equivalents The Mullard maintainance manual gives lots of alternatives with base / component changes, though you have to work backwards to get it! Jim.