New Guy w/my Foreplay - Page 4 - 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 9th February 2003, 02:44 AM   #31
diyAudio Member
 
Sch3mat1c's Avatar
 
Join Date: Jan 2003
Location: Milwaukee, WI
Send a message via ICQ to Sch3mat1c Send a message via AIM to Sch3mat1c
Yes, clear-top 12AU7s..(exactly as pictured) I picked 'em over top getter because they look much more 1337
(And it's not PAIR, it's a HEPTET! For output of course...a whopping 6W into 6.6k )

Tim, Senior Thread Hijacker
  Reply With Quote
Old 9th February 2003, 02:49 AM   #32
diyAudio Member
 
Join Date: Feb 2003
Location: San Antonio, Texas
What's the scoop on your avatar
Sch3mat1c
  Reply With Quote
Old 9th February 2003, 03:11 AM   #33
diyAudio Member
 
Sch3mat1c's Avatar
 
Join Date: Jan 2003
Location: Milwaukee, WI
Send a message via ICQ to Sch3mat1c Send a message via AIM to Sch3mat1c
WOT Headphones amp. (Choky knows WOT as With Output Transformer. )
6DJ8 in parallel, parafeeding (RC coupling) a 50:50k ohm input transformer in reverse (mmm, mu-metal core).
Current power source is a crappy deal I made years ago, does 6.3VAC + 100VDC 15mA.
  Reply With Quote
Old 9th February 2003, 03:12 AM   #34
diyAudio Member
 
Sch3mat1c's Avatar
 
Join Date: Jan 2003
Location: Milwaukee, WI
Send a message via ICQ to Sch3mat1c Send a message via AIM to Sch3mat1c
Humm I attached a photo to that...oh well.

Full size of the avatar:
Attached Images
File Type: jpg wot_amp2.jpg (9.9 KB, 240 views)
  Reply With Quote
Old 9th February 2003, 03:13 AM   #35
diyAudio Member
 
Join Date: Feb 2003
Location: San Antonio, Texas
Cool!
  Reply With Quote
Old 9th February 2003, 03:14 AM   #36
diyAudio Member
 
Sch3mat1c's Avatar
 
Join Date: Jan 2003
Location: Milwaukee, WI
Send a message via ICQ to Sch3mat1c Send a message via AIM to Sch3mat1c
Thanks!

Underside:
Attached Images
File Type: jpg wot_amp1.jpg (15.7 KB, 238 views)
  Reply With Quote
Old 9th February 2003, 03:16 AM   #37
diyAudio Member
 
Sch3mat1c's Avatar
 
Join Date: Jan 2003
Location: Milwaukee, WI
Send a message via ICQ to Sch3mat1c Send a message via AIM to Sch3mat1c
Probably wouldn't hurt to have some blocking resistors or something in here somewhere, but whatever.
Ah heck, it's too tight

- Not shown: a few Rs and Cs in series with the input to alter the F response. Bass is too boomy with my $30 RadioSnack headphones.

Tim
Attached Images
File Type: gif wot headphone amp.gif (5.5 KB, 253 views)
  Reply With Quote
Old 9th February 2003, 07:19 PM   #38
7N7 is offline 7N7  United Kingdom
diyAudio Member
 
7N7's Avatar
 
Join Date: Jan 2003
Location: England
Quote:
Originally posted by dhaen
Hmm,

But, just because a valve was not designed for an audio application in the first place, does not necessarily mean it'll be no good for audio.

Cheers,
This of course is absolutely correct. My recent work tells me that the 6DN7 (line osc/output dual triode) should make (and apparently does make) a very good valve for audio.

Unfortunately ECC82/12AU7/5963/6198 etc, does not.

7N7
__________________
Plug them in and light them up
  Reply With Quote
Old 9th February 2003, 07:29 PM   #39
7N7 is offline 7N7  United Kingdom
diyAudio Member
 
7N7's Avatar
 
Join Date: Jan 2003
Location: England
Quote:
Originally posted by Wardsweb
For what it's worth, a reply from another board:

The CV 4003 and the ECC82 are not the same. The ECC was manufactured specifically for audio application. This doesn't mean the CV 4003 is crap, just not manufactured to the same exacting standards that the ECC series.
This is not true.

CV4003 was made to very exacting standards; also known as Mullard's M8136, it was manufactured to meet a military specification. CV4xxx series valves are ruggedised and had to meet a number of stringent tests in this regard (cf the American "W" suffix). All the Mullard "M" series valves were special quality, which is why they received thier special nomenclature. Brimar's "T" ("trustworthy") range was another example of the same thing.

Your average ECC82/CV491 was turned out by the million, and was probably very good - within its metier, which was TV sets, instrumentation, guitar amplifiers etc.

Not in my amplifiers though (and neither is CV4003/M8136).

7N7
__________________
Plug them in and light them up
  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
Foreplay III pre amp jtwrace Tubes / Valves 2 18th May 2009 02:57 AM
FS - Bottlehead Foreplay III john65b Swap Meet 2 16th July 2007 03:14 AM
Bottlehead Foreplay FS idex Swap Meet 3 8th January 2006 11:23 PM
Bottlehead Foreplay. castlesteve Swap Meet 2 14th June 2004 08:05 PM
first time foreplay perhellion Tubes / Valves 2 19th March 2002 01:44 AM


New To Site? Need Help?

All times are GMT. The time now is 03:51 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