Help, what is this (Marconi 6204) ? - diyAudio
Go Back   Home > Forums > Amplifiers > Tubes / Valves

Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

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
Reply
 
Thread Tools Search this Thread
Old 2nd April 2013, 09:28 PM   #1
tricomp is offline tricomp  Denmark
diyAudio Member
 
Join Date: May 2004
Location: Jutland
Default Help, what is this (Marconi 6204) ?

This picture from an ebay auction.
What is it?
Seller claims 1/2 of a 6X5, more or less.
Sibley's Tube Lore doesn't know.
Neither does any RCA manuals I have.
Google is empty.
WHAT is it?

rgds,

/tri-comp
Attached Images
File Type: jpg Marconi 6204.JPG (52.0 KB, 225 views)
  Reply With Quote
Old 2nd April 2013, 09:48 PM   #2
diyAudio Member
 
lazzer408's Avatar
 
Join Date: Sep 2010
Location: Chicago
Tetrode
  Reply With Quote
Old 2nd April 2013, 09:54 PM   #3
tricomp is offline tricomp  Denmark
diyAudio Member
 
Join Date: May 2004
Location: Jutland
Quote:
Originally Posted by lazzer408 View Post
Tetrode
..and how do you know?
Any data available?

rgds,

/tri-comp
  Reply With Quote
Old 2nd April 2013, 10:21 PM   #4
tricomp is offline tricomp  Denmark
diyAudio Member
 
Join Date: May 2004
Location: Jutland
I have a Military Handbook covering pretty much anything in tubes over time.

The 6204 just isn't there, have a look.
Makes you wonder if it was ever in production and the ebay specimen is a prototype sample.

rgds,

/tri-comp
Attached Files
File Type: pdf Missing_6204_MIL-213A.pdf (192.7 KB, 26 views)
  Reply With Quote
Old 2nd April 2013, 10:21 PM   #5
tomchr is offline tomchr  United States
diyAudio Member
 
tomchr's Avatar
 
Join Date: Feb 2009
Location: Greater Seattle Area
Perhaps you should try Bing... It comes up with the following:

TUBE 6204-MCN Marconi - Tetrode | Vacuum tube online

No data, though. But at least it shows as a tetrode.

~Tom
__________________
Modulus-86: Composite amp achieving 0.00018 % THD. Damn Good 300B, Novar Spud, 21st Century Maida Reg., Filament Reg., etc.
Neurochrome : : Audio - http://www.neurochrome.com/audio - Engineering : : Done : : Right
  Reply With Quote
Old 2nd April 2013, 10:26 PM   #6
tricomp is offline tricomp  Denmark
diyAudio Member
 
Join Date: May 2004
Location: Jutland
Hi Tom,

Thanks, Google shows the same.
This doesn't prove anything, like the ebay auction stating it's a rectifier doesn't prove anything.
Have a look at the pdf-page above I pulled from the Military hand-book.
The reason why I'm interested is that if it's really a rectifier I would buy it.
I have planned a hi-gloss yellow chassis Marconi 6V6GT/G PP integrated stereo-amp with green hi-gloss xfmr-covers for the future.
The pale-blue octals would fit right in if they are indeed rectifiers.

...or is that over the edge...?

rgds,

/tri-comp

Last edited by tricomp; 2nd April 2013 at 10:28 PM.
  Reply With Quote
Old 3rd April 2013, 12:48 AM   #7
kevinkr is offline kevinkr  United States
diyAudio Moderator
 
kevinkr's Avatar
 
Join Date: Sep 2004
Location: Boston, Massachusetts
Blog Entries: 6
Strange I have data for 6203 and 6205, but not 6204 - and this in a variety of Sylvania, GE and other tube manuals. Franks has no reference to it, even in short data or the Vade Mecum which is pretty comprehensive.
__________________
"Extraordinary claims require extraordinary evidence." - Carl Sagan
  Reply With Quote
Old 3rd April 2013, 04:02 AM   #8
tricomp is offline tricomp  Denmark
diyAudio Member
 
Join Date: May 2004
Location: Jutland
That, kevinkr is exactly what I mean.
I also have a lot of manuals on hand and no ref. to a 6204 in any of them.
Yet there can be no doubt that it exists looking at the picture and even the box has the number 6204 printed on it.

/tri-comp
  Reply With Quote
Old 3rd April 2013, 12:13 PM   #9
tricomp is offline tricomp  Denmark
diyAudio Member
 
Join Date: May 2004
Location: Jutland
Page from old AVO-tester manual.
No such thing as a 6204.

Very, very strange...

/tri-comp
Attached Files
File Type: pdf AVO Tester.pdf (848.7 KB, 14 views)
  Reply With Quote
Old 3rd April 2013, 05:22 PM   #10
kevinkr is offline kevinkr  United States
diyAudio Moderator
 
kevinkr's Avatar
 
Join Date: Sep 2004
Location: Boston, Massachusetts
Blog Entries: 6
I will try to have a look at the charts on my Hickok 539B and in the manuals, but I suspect it will be the same story.

They might be worth having as a conversational curiosity, but even knowing what they are (and I don't.. lol) I would not design them into anything. There has got to be a reason why this number was assigned and never released into the wilds..
__________________
"Extraordinary claims require extraordinary evidence." - Carl Sagan
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Marconi 2005 jartiili Equipment & Tools 4 10th November 2013 10:38 PM
Marconi ML6 Triodes T1509 Swap Meet 0 12th December 2012 07:16 AM
marconi tubes....can someone idntify these preludefan Tubes / Valves 6 22nd August 2012 11:37 AM
2A3 Marconi RCA radiostar Vendor's Bazaar 0 23rd January 2012 06:24 PM
Marconi TF2005R reddish75 Equipment & Tools 3 6th January 2011 11:15 AM


New To Site? Need Help?

All times are GMT. The time now is 07:07 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2