Vintage kt88 pp mod suggestions - 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
Thread Tools Search this Thread
Old 19th September 2015, 05:40 PM   #1
diyAudio Member
Join Date: Dec 2011
Default Vintage kt88 pp mod suggestions

Hello friends, finally i got my first tube amplifiers. Some vintage mexican kt88 pp monos. I converted them from UL tetrodes to triode mode and rebiased them 70% emission. Also bypassed the first tube stage for "radio" input, since my signals come from srpp tube 2V "lampized" dac and cd player. Bypassed some resistors in the signal path also.

So i would kindly ask your wise advices for getting most precious sound of them. I connect them to 16"s 96db 8ohm technics speakers. Following are both schematics, factory and current mods one.

Also, how can i know the feedback db amount? Have read Pass article about feedback distortion, but not sure how to check the amps feedback db amount. I would like to experiment with 15db, but not shure for this local feedback...I would not touch nfb if adviced for it

Also how do you know if power stage operates class a or ab?



Thank you
  Reply With Quote
Old 19th September 2015, 05:44 PM   #2
diyAudio Member
Join Date: Dec 2011
Better schematics
  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
PP KT88, Need help! EEApprentice Tubes / Valves 44 1st December 2012 09:17 PM
Which KT88 PP and which Transformers? Dave S Tubes / Valves 66 8th January 2012 04:37 PM PP KT88 tim614 Tubes / Valves 0 17th February 2011 04:16 AM
Kt88 Pp barossi Tubes / Valves 2 24th December 2008 05:55 PM
Three PP KT88 designs. Which one ... (please;-) WE91 Tubes / Valves 28 2nd January 2008 09:16 AM

New To Site? Need Help?

All times are GMT. The time now is 12:23 AM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2015 DragonByte Technologies Ltd.
Copyright 1999-2015 diyAudio

Content Relevant URLs by vBSEO 3.3.2