Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Solid State Talk all about solid state amplification.

Gain adjust on an Adcom 545.
Gain adjust on an Adcom 545.
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 10th December 2005, 11:47 PM   #1
K-amps is offline K-amps  United States
diyAudio Member
K-amps's Avatar
Join Date: Nov 2003
Location: Indiana
Default Gain adjust on an Adcom 545.

I just modded an old 545. I made it dual mono with extensive bypassing on the power caps. I also heavily "reduced" feedback and while I ensured equal voltage gain wrt the stock NFB, I feel there is a little more hiss than before at the output.

Using 111db Horns so need to tame the hiss.

I do not want to increase the FB back up because I LOVE the sound like this. It is much more detailed and punchy. The voicing is a tad thicker in the mids, which I like. But imaging and detils, much better.

Any ideas? Chris? Dennis?....Nelson?


  Reply With Quote
Old 11th December 2005, 12:39 AM   #2
anatech is offline anatech  Canada
diyAudio Moderator
anatech's Avatar
Join Date: Jun 2004
Location: Georgetown, On
Gain adjust on an Adcom 545.
Hi Arif,
Less feedback = more gain. Now you need to try and reduce circuit induced noise. It won't be easy but may be possible. The circuit will have to be modified I feel.

You might want to try replacing the diff pair with FETs and clamping the drain voltage, cascode style. Just a suggestion. I haven't had a chance to try it myself yet.

  Reply With Quote


Gain adjust on an Adcom 545.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
How To adjust Adcom 565 Bias HiFiMonk Solid State 1 25th November 2005 12:09 AM
adjust gain of Brian GT's 3875 moreismore Chip Amps 0 23rd November 2005 04:33 PM
Krell PAM-5 gain adjust JeroenDortmans Solid State 0 11th August 2005 03:49 PM
Gain adjust? Where? jimbo1968 Chip Amps 5 30th June 2005 04:56 PM

New To Site? Need Help?

All times are GMT. The time now is 03:57 AM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 16.67%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio