Apt Holman Pre-Amp Mystery - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

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 29th July 2008, 12:56 AM   #1
diyAudio Member
 
Join Date: Jul 2008
Default Apt Holman Pre-Amp Mystery

Has anyone successfully upgraded the TL072 op-amps in the Apt Holman Pre-Amp with something new and improved? About ten years ago I tried using AD712 and OPA275.......both had negative effects on the circuit; there were load pops when any signal switch was deployed. I called Tom Holman, and though he had no advice to give regarding a better op-amp, he did mention that the way he used the TL072 in the pre-amp made substitutions problematic.

So....has anyone found a better device that works?

óJames
  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
Apt Holman Pre (mod/ restore) swingarm63 Solid State 3 30th April 2009 02:01 PM
Apt Holman Sonaroj Solid State 1 2nd July 2006 09:53 AM
T. Holman's paper darkfenriz Solid State 3 3rd April 2006 12:34 AM
Holman's AES paper... mikeks Solid State 2 9th July 2004 08:40 PM
APT Holman PreAmp SkyChu Solid State 5 29th October 2002 02:23 AM


New To Site? Need Help?

All times are GMT. The time now is 05:04 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