Look what I found this weekend! - Page 3 - diyAudio
Go Back   Home > Forums > Amplifiers > Tubes / Valves
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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
Thread Tools Search this Thread
Old 31st January 2006, 01:52 AM   #21
rdf is offline rdf  Canada
diyAudio Member
rdf's Avatar
Join Date: Jun 2004
Location: big smoke
Originally posted by beamnet
and exactly WHAT iron are you going to use?
the biggest opt is the hammond 275 watt opt
Jeez, so don't run all 3000 volts!
  Reply With Quote
Old 31st January 2006, 01:58 AM   #22
diyAudio Member
Tubelab_com's Avatar
Join Date: Jul 2005
Location: West Virginia panhandle
Actually they are not as bright as an 833A, they just pump out more heat.

The 4-250 and the 4-400 are very similar, the 4-400 has radiator fins on the plate, so it can dissipate more power. They are both tetrodes. The screen grid voltage is 800 volts max, which would allow triode connection at low (800 volts) voltages.

Operation as a tetrode can lead to nonlinearities, but it is also possible. Neither of these conditions is optimum for a good audio amp.
Tubelab, it's 5 year mission. To explore strange new tubes, to seek out new circuits and topologies, to boldly go where no tube has gone before......
  Reply With Quote
Old 31st January 2006, 02:20 AM   #23
diyAudio Member
Join Date: Apr 2003
Location: Portland,Oregon
Blog Entries: 4
Send a message via AIM to DigitalJunkie
You might be able to get away with fewer of the Hammond trannies than you'd think.


"I found that the doubled-up output transformers really isn't necessary. Dogzilla works just fine with "just" a single Hammond 1650R. Just goes to show how conservatively rated these things are; I'm still getting well in excess of 200 watts out of a single transformer rated at 100 watts (albeit for hi-fi use), with no sign of overheating."

Granted that is for Guitar amp duty,but even in HiFi applications you can "push" them a fair bit.
  Reply With Quote
Old 31st January 2006, 08:32 AM   #24
SHiFTY is offline SHiFTY  New Zealand
diyAudio Member
SHiFTY's Avatar
Join Date: Jul 2002
Location: New Zealand
Well for a nice simple amp, how about a single-ended 6L6 with 12SN7 for a driver?

That would sound good, and be very easy to make.
  Reply With Quote
Old 31st January 2006, 05:19 PM   #25
diyAudio Member
Join Date: Aug 2005
Sounds like a good place to start. I still have a bunch of boxes to sort. Looks like my project backlog just got bigger Now off to search... Thanks.
  Reply With Quote


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
Wierd Projects for the Weekend !!!!! poynton Everything Else 9 5th February 2007 02:46 AM
L.A. VTV Audio Expo this weekend Apex Jr Everything Else 1 31st May 2006 03:40 PM
VTV Expo this weekend in New Jersey timothy Everything Else 0 4th May 2006 09:07 PM
Nothing to do this weekend?...here is a toy for you, have fun! destroyer X Solid State 13 30th January 2006 11:14 AM

New To Site? Need Help?

All times are GMT. The time now is 10:59 PM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2