New tube stash question

Davestp1 · 7th September 2008, 05:08 PM

Hi,

I just picked up a small tube caddy which included about 75 tubes of various makes/quality, none in boxes. Although it was mostly full of TV type tubes (the caddy was from an old tv repair shop in Montreal) it also included a pair of big bottle Mullard 5U4G's, a yellow shield label Mullard brown base GZ34, 2 Mullard 12ax7's and 3 of each Mullard 12au7's and 12at7's all with the shield logos, in both white and yellow lettering. It also included a couple of Rogers labled 12ax7's made in Holland and a 12ax7 tube labled "Lafayette" w what appeared under a magnifying glass to be the "Toshiba" name. All of these tubes measure well enough on my old mercury tester to keep.

Is there a site that would tell me about the differences in the mullards (short plate/long plate etc) and how to read the codes etched on them? Who would have made the Rogers and Lafayette tubes?
Thanks, Dave

Tom Bavis · 7th September 2008, 06:19 PM

Lafayette could be anything - the Rogers ones sound like Philips (sold as Amperex in US...). Look here for the secret decoder... thanks to Brent Jessee... http://www.audiotubes.com/mullcode.htm

rl5555 · 17th September 2008, 09:37 PM

Great find --pair of big bottle Mullard 5U4G's, a yellow shield label Mullard brown base GZ34 --- These could be valuable.

7th September 2008, 05:08 PM	#1
Davestp1 diyAudio Member Join Date: Sep 2008	New tube stash question Hi, I just picked up a small tube caddy which included about 75 tubes of various makes/quality, none in boxes. Although it was mostly full of TV type tubes (the caddy was from an old tv repair shop in Montreal) it also included a pair of big bottle Mullard 5U4G's, a yellow shield label Mullard brown base GZ34, 2 Mullard 12ax7's and 3 of each Mullard 12au7's and 12at7's all with the shield logos, in both white and yellow lettering. It also included a couple of Rogers labled 12ax7's made in Holland and a 12ax7 tube labled "Lafayette" w what appeared under a magnifying glass to be the "Toshiba" name. All of these tubes measure well enough on my old mercury tester to keep. Is there a site that would tell me about the differences in the mullards (short plate/long plate etc) and how to read the codes etched on them? Who would have made the Rogers and Lafayette tubes? Thanks, Dave

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Tube stash strategy and testing (long)	mashaffer	Tubes / Valves	28	6th September 2008 09:42 PM
Tube PSU question	Greyskale	Power Supplies	8	27th February 2008 09:06 AM
What can I do with these? (tube and OPT question)	needtubes	Tubes / Valves	7	8th March 2005 01:01 PM
WE old tube question	filippo22	Tubes / Valves	6	26th December 2003 07:26 PM
Tube CAD Question	Aud_Mot	Tubes / Valves	0	6th October 2002 03:53 AM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

7th September 2008, 06:19 PM	#2
Tom Bavis diyAudio Member Join Date: Jun 2002 Location: Macedon NY	Lafayette could be anything - the Rogers ones sound like Philips (sold as Amperex in US...). Look here for the secret decoder... thanks to Brent Jessee... http://www.audiotubes.com/mullcode.htm

17th September 2008, 09:37 PM	#3
rl5555 diyAudio Member Join Date: Jun 2004 Location: Los Angeles	Great find --pair of big bottle Mullard 5U4G's, a yellow shield label Mullard brown base GZ34 --- These could be valuable.