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 9th March 2004, 08:50 AM   #1
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Blog Entries: 5
Default valve info? NEC 30M-P25

I picked up a small Sony R-R that used this tube in an SE output stage (and a 3rd one in the head driver amp?). I'm guessing it is one of those rarish single manufacturer Japanese tubes... does anyone know anything about them. Of primary interest is what the likely primary would be on the OPTs.

It also used 6267s on the front end -- i gather this is an EF86 variant.

dave
__________________
community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi
p10-hifi forum here at diyA
  Reply With Quote
Old 9th March 2004, 10:08 AM   #2
diyAudio Senior Member
 
fdegrove's Avatar
 
Join Date: Aug 2002
Location: Belgium
Hi,

Dunno about the NEC tube but :

Quote:
It also used 6267s on the front end -- i gather this is an EF86 variant.
Yep. The direct equivalent would be the EF806S which is the SQ version of the EF86/6CF8?

The Soviet equivalent is the 6(shh)23Pi.

Cheers,
__________________
Frank
  Reply With Quote
Old 9th March 2004, 11:37 AM   #3
AV8R is offline AV8R  United Kingdom
diyAudio Member
 
Join Date: Feb 2004
Location: Cambridge
Default 30M P25

I will have to dig through my old stuff, but from memory it is a 30 volt heater pentode made by Matsushita. Sony machines tended to use low volts HT so out impeadance about 3 K Ohm. 2 watts output.
  Reply With Quote
Old 9th March 2004, 05:32 PM   #4
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Blog Entries: 5
Default Re: 30M P25

Quote:
Originally posted by AV8R
I will have to dig through my old stuff, but from memory it is a 30 volt heater pentode made by Matsushita. Sony machines tended to use low volts HT so out impeadance about 3 K Ohm. 2 watts output.
That jives... the HV tap on the trafo is marked 140V IIRC. And 30+30+30+6.3+6.3 = 102.6 V -- pretty close to what you'd expect for a series string

3K 2 W would make it suitable for 50EH5 or 50C5 spud amp.

dave
__________________
community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi
p10-hifi forum here at diyA
  Reply With Quote
Old 10th March 2004, 09:52 AM   #5
AV8R is offline AV8R  United Kingdom
diyAudio Member
 
Join Date: Feb 2004
Location: Cambridge
Default 30M P25

All I can add from my last post, is that I made a mistake, it's not Matsushita but Nippon Electric Company(NEC) and I could not find data save that it is a B7G base Power pentode with 30 volt heater. 35C5 is nearest relative. 50C5 is taller and more power.
  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
Swap Shanling CD-T80 valve CD player for Quad valve equiment johnm Swap Meet 2 24th September 2009 12:15 PM
Need info on my Onkyo, can't find any info anywhere. gixxierific Digital Source 0 19th April 2009 03:49 PM
Info required : GAMMA VALVE AMPS.. aquapiranha Tubes / Valves 0 25th October 2007 05:36 PM
Help - need some info on this valve amp, please horace Tubes / Valves 9 14th October 2007 01:25 PM
Convert a non-valve amp to a Valve (tube) Amp seanthomas46 Tubes / Valves 11 6th September 2005 09:52 PM


New To Site? Need Help?

All times are GMT. The time now is 05:06 PM.


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