heavy duty valve amps.... for PA use....? - 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 21st January 2004, 09:42 PM   #1
jc808 is offline jc808  United Kingdom
diyAudio Member
 
Join Date: Jan 2004
Location: london
Default heavy duty valve amps.... for PA use....?

Valve power amp, rackmountable, 2- channel, approx 500-800wpc

Do such units exist? and where can you get em. (ive searched all over the web)

the closest ones i can find are the marshall ones, 100wpc, 200 bridged, not sure thats enough for my uses.

Can anyone point me in the right direction? regards jc808
  Reply With Quote
Old 21st January 2004, 10:27 PM   #2
diyAudio Member
 
Join Date: May 2003
Location: Morton, Illinois
Default Can be done

but not cheap. Special order items.
  Reply With Quote
Old 21st January 2004, 10:34 PM   #3
jc808 is offline jc808  United Kingdom
diyAudio Member
 
Join Date: Jan 2004
Location: london
thanks for the reply, Steve, I suspected so.

Do you happen to know of a company in the uk that undertakes such tasks?

i reckon, looking at the 'home project photo albums' thread that a few of the users of this site could do a half-decent job ;-) at least
  Reply With Quote
Old 21st January 2004, 10:54 PM   #4
mcs is offline mcs  Denmark
diyAudio Member
 
Join Date: Aug 2003
Location: Denmark
You can get 340W from a pair of 811As... And the supply voltage is only 1500V

1900W from a pair of 833As at 3000V is another option...

Or perhaps a PPP amp running at a lower voltage is a more "sane" option.

Why do you need that much power BTW?

Best regards,

Mikkel C. Simonsen
  Reply With Quote
Old 21st January 2004, 11:44 PM   #5
jc808 is offline jc808  United Kingdom
diyAudio Member
 
Join Date: Jan 2004
Location: london
1900w? ouch

the reason i was thinking about such a powerful option was i was thinking about doing a few parties, and wanted something powerful, with a little 'headroom' to avoid clipping (which is not such an issue with valve amps, but...)

a custom-made 833a system would be roughly how impactive on the wallet?
and fairly large, one would presume..?

youd also need a three-phase inlet with a 3000v draw, surely :-s

cheers for all the answers so far guys (and gals?), youve been a great help

fyi the size of room i would be playing in would be no larger than 50ftx 40ft, max
  Reply With Quote
Old 22nd January 2004, 02:07 AM   #6
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
Or forced-air tubes like 4CX250.

But yes, typically you don't need "quality" tube audio of such power levels, especially for PA use, you might as well use SSatanic equipment.

Tim
__________________
Seven Transistor Labs
Projects and Resources
  Reply With Quote
Old 22nd January 2004, 03:44 AM   #7
SHiFTY is offline SHiFTY  New Zealand
diyAudio Member
 
SHiFTY's Avatar
 
Join Date: Jul 2002
Location: New Zealand
On eBay about a year ago there was a pair of massive PPP KT88 amps with about 16 KT88 per channel... They were used by some Sound System for jungle/rave parties in London apparently!

They looked pretty tired, but who knows? I remember they had massive transformers and the ad stated that the tubes glowed in time with the music... glowing plates perhaps?
  Reply With Quote
Old 22nd January 2004, 07:17 AM   #8
Colt45 is offline Colt45  Serbia
diyAudio Member
 
Join Date: Feb 2002
Location: Canada
Send a message via ICQ to Colt45
You dont need 600w for a 40x50' room.
  Reply With Quote
Old 22nd January 2004, 07:29 AM   #9
diyAudio Member
 
Join Date: May 2002
Location: Switzerland
Quote:
1900w? ouch
The largest tube-amp I have seen so far was a 3 kW one (mono only). It wasn't rack mountable - it was consisting of a whole rack!

When you talk about PA, I assume it is for FOH and not for a single instrument, is it ?
A large tube amp for that purpose was the Dynacord "Gigant" (German for giant) with 200 Watts. Maybe they can be obtained 2nd hand. But you will need two of them since they are also monaural.

Regards

Charles
  Reply With Quote
Old 22nd January 2004, 10:14 AM   #10
mcs is offline mcs  Denmark
diyAudio Member
 
Join Date: Aug 2003
Location: Denmark
Quote:
Originally posted by jc808
1900w? ouch

a custom-made 833a system would be roughly how impactive on the wallet?
and fairly large, one would presume..?
I guess it would be very expensive. The circuit can be very simple (look at some of the old WE or Altec amps - a couple of transformers and four tubes). But all parts made for high voltages are very expensive and hard to get. I don't think anybody makes output transformers with 3000V isolation. A 1000-1200V amp. would probably be possible, but still very expensive. But I wouldn't make an amp like that - it's bloody dangerous!

You would need a lot of expertise to take on a project like that...

I would think you should look for a more sane/normal amp - perhaps 100-150W. And if that's not loud enough it's probably because your speakers are too ineffective.

Best regards,

Mikkel C. Simonsen
  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
heavy duty grille. matteroftaste Multi-Way 0 24th May 2007 01:32 PM
[INDIA]Building heavy duty Chasis for Power Amps. ajju Parts 11 20th November 2004 03:55 AM
Heavy Duty 150W Amp ChocoHolic Solid State 21 24th June 2004 09:09 PM


New To Site? Need Help?

All times are GMT. The time now is 05:56 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