Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki 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

high power tube amp kits using KT120s or KT150s?
high power tube amp kits using KT120s or KT150s?
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 27th June 2020, 09:54 PM   #31
wg_ski is online now wg_ski  United States
diyAudio Member
 
Join Date: Oct 2007
No real need to go to a custom OPT - if the Hammonds are good enough for you. The 1650W will do it. I’m driving mine with 6 6550’s (Tung-sol, the ones that look like the old Sovtek KT88) because they are common tubes, avoiding the long term availability issues of KT150’s or sweep tubes. You could just as easily use EL34’s even, but it would take 8 or 10 of them. That trafo is heavy - bigger than the power transformer in the old PV CS-800. And you can get them at Digikey.

5k a channel? No way. Just the big stuff cost me $1k per channel - you would at LEAST add a zero, or more, to have someone build this for you.
  Reply With Quote
Old 27th June 2020, 10:49 PM   #32
OscarS is online now OscarS  United States
diyAudio Member
 
Join Date: Jan 2011
Quote:
Originally Posted by CaterpilarSK View Post
just a friendly reminder...Just forget about high power tube stuff for a second. Think of the problems and the costs. I get it you might be rich but you cant pay physics to not apply to you.

Firs of all 150W with a KT150/120. There is not a lot of factory amplifier that properly utilise the tubes let alone kits.

If you want that power level you seriously need to look into the maths and theory behind. No way round arround. Assuming you want to build it. This aint a TDA or a semiconductor jobbie.

I personally think its well worth it to look into it. I myself built the Mullard 5-20W amplifier ground up designed the PCBs and went on to design something proper with KT88 (80or so watts) and its been a year and I am still not done with it. Eventually I want to build with KT150s but those tubes are a challenge. As mentioned before it would be A LOT smarter to go with two monoblocks. The weight will already be monstrous. The power transformer needs to be very beefy to a custom voltage, the output transformer needs to be a custom job aswell, wound to impedances to match the currents those KT150s can deliver at their max allowed voltage. Its not as simple as buy a kit and snot the solderpoint together and youre done. You dont quite realise the design challenges high power vacuum tube amplifier impose. Impracticalities, and the shear ridicilousness (sorry for the spelling) what a 150W KT150 amp would be (and no 150 doesnt equape to 150W). You would need to run a quad of them for each channel. If you got the money I just recommend you ask a credible manufacturer to build something for you to request so you get a properly designed amplifier for what you want. For the cost of course.. Prepare yourself to spend 5K on each channel.

Just to think of the shear current that would run trough the windings of the transformers 4 ohm output makes my spidey senses tingle enough to realise it would be a 25kg output transformer..thats just the OTP..

Thanks for your input. The whole KT-thing was just an initial impression I got from the basic research I did as to what tubes were capable of what. I guess you can say I've learned they're not a necessity. I'm not rich by any stretch of the imagination, otherwise I'd have what I want already. I'm looking for a good value in a high power tube amp, hence the search for a good kit. Two monoblocks are exactly what I'm looking at with the M-125's from Bob @ VTA.
  Reply With Quote
Old 28th June 2020, 05:24 AM   #33
Diabolical Artificer is offline Diabolical Artificer  United Kingdom
diyAudio Member
 
Diabolical Artificer's Avatar
 
Join Date: May 2014
Location: UK
I built these, see pics, more here - 120w PP UL monoblocks. 6 EL34's, overwound mains toroid tfmr, 1100u reservoir caps, Hammond 1650TA OP's, protection circuit, etc, etc. They took a long time to build though. Sorry not available as a kit but I can send you the schematic's though.


Andy.
Attached Images
File Type: jpg DSC01334.JPG (160.3 KB, 108 views)
File Type: jpg DSC01336.JPG (160.1 KB, 114 views)
File Type: jpg DSC01323.JPG (161.3 KB, 105 views)
  Reply With Quote
Old 28th June 2020, 09:03 AM   #34
Kjeldsen is offline Kjeldsen  Denmark
diyAudio Member
 
Join Date: Dec 2003
Location: Randers, Denmark
Maybe you should look at bass head kits. If you are lucky they will also be suitable for hifi
Amp-Kit Plexi 150W Bass Guitar
__________________
http://kjeldsensforbindelser.dk
  Reply With Quote
Old 28th June 2020, 10:26 AM   #35
russc is offline russc  England
diyAudio Member
 
Join Date: Mar 2011
Location: W Yorkshire
Quote:
Originally Posted by OscarS View Post
I need lots of power to re-create what it sounds/feels like to be at a death/grindcore metal concert.
HiFi is not the OPs objective.
Don't forget to budget for a room with crap acoustics and invite lots of sweaty friends around to listen.

On a serious note, please take care of your hearing.
  Reply With Quote
Old 28th June 2020, 11:46 AM   #36
duncan2 is offline duncan2  United Kingdom
diyAudio Member
 
Join Date: Mar 2013
Location: Scotland.
I am glad you mentioned that Russc that is something I advised many people to watch out for on a very well known UK public help website .


I have all the American data on hearing loss due to insanely loud movies to which very many of the UK public complained about vigorously .


Once those nerves are dead --that's it !

Ear bleeds watching movies and the movie theater refusing to tone down the racket .


It takes many years to feel the full effect of this --does anybody fancy having a hole drilled in your skull and wires attached directly to your brain ?


Check out the number of US children with hearing aids.
  Reply With Quote
Old 28th June 2020, 02:15 PM   #37
OscarS is online now OscarS  United States
diyAudio Member
 
Join Date: Jan 2011
Quote:
Originally Posted by Kjeldsen View Post
Maybe you should look at bass head kits. If you are lucky they will also be suitable for hifi
Amp-Kit Plexi 150W Bass Guitar
Not looking to "take chances", thank you.
  Reply With Quote
Old 28th June 2020, 02:17 PM   #38
OscarS is online now OscarS  United States
diyAudio Member
 
Join Date: Jan 2011
Quote:
Originally Posted by Diabolical Artificer View Post
I built these, see pics, more here - 120w PP UL monoblocks. 6 EL34's, overwound mains toroid tfmr, 1100u reservoir caps, Hammond 1650TA OP's, protection circuit, etc, etc. They took a long time to build though. Sorry not available as a kit but I can send you the schematic's though.


Andy.
Thanks for your input Andy, but the M-125s are available as a kit, so it wouldn't make sense going this route.
  Reply With Quote
Old 28th June 2020, 04:38 PM   #39
Kjeldsen is offline Kjeldsen  Denmark
diyAudio Member
 
Join Date: Dec 2003
Location: Randers, Denmark
Quote:
Originally Posted by OscarS View Post
Not looking to "take chances", thank you.
You can write to them and ask. I know Marshall have som guitar power amps, that are good for hifi as well.
__________________
http://kjeldsensforbindelser.dk

Last edited by Kjeldsen; 28th June 2020 at 04:56 PM.
 

Reply


high power tube amp kits using KT120s or KT150s?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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
High Power Tube Amplifier comnoz Tubes / Valves 51 4th February 2018 06:16 PM
High-end Tube amp kits (all-included) regiregi22 Tubes / Valves 40 28th April 2013 05:51 AM
DIY High Power Car Tube Amp wilkes5 Tubes / Valves 32 7th November 2012 07:41 AM
Simple SE with KT120s oddboy Tubelab 9 14th March 2011 04:46 AM
High Power Tube Car Amp plate_follower Car Audio 6 28th October 2006 08:55 PM


New To Site? Need Help?

All times are GMT. The time now is 10:46 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Copyright ©1999-2020 diyAudio
Wiki