Help with 1626 PSE Amp needed - diyAudio
Go Back   Home > Forums > Amplifiers > Tubes / Valves
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs 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

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 30th June 2004, 10:32 PM   #1
diyAudio Member
Join Date: Sep 2003
Location: Hamburg
Default Help with 1626 PSE Amp needed

Hi everybody!

I just finished my latest project, a 1626 PSE Amp.

Click the image to open in full size.

I used a 47F cathode C, though.

After a while of listening, I thought, that the bass is a little "thin".

Looking at the bode-plot I discovered the following:

What are your suggestions to improve the output?

Thanks for your input.

Attached Images
File Type: jpg frequenzgang.jpg (55.3 KB, 202 views)
  Reply With Quote
Old 1st July 2004, 09:13 AM   #2
diyAudio Member
Join Date: Sep 2003
Location: Hamburg
Default sorry, forgot to post the bode plot

WEll, here is the above mentioned bode plot....

What do you think?
Attached Images
File Type: jpg frequenzgang.jpg (55.3 KB, 178 views)
  Reply With Quote
Old 1st July 2004, 05:22 PM   #3
benny is offline benny  Australia
diyAudio Member
benny's Avatar
Join Date: May 2004
Location: Melbourne, Australia
Send a message via MSN to benny
the very first thing i noticed was that there is no interstage coupling caps. And there is no ground resistor between first and final stage.

the coupling cap and ground resistor before a stage form a highpass filter with a -6bD/octave slope with a -3dB point calculated by f=1/(2*pi*R*C)

R and C represent values of these components... i'll let you guess which one represents the coupling cap and which one represents the ground resistor.

you can also use a bit of neg feedback to help flatten out frequency response.

also try using a tone control. something simple like a baxandall tone circuit would take you not much time to put together, and will give you plenty of control over frequency response.

  Reply With Quote
Old 25th October 2004, 02:20 PM   #4
bigbulb is offline bigbulb  Canada
diyAudio Member
Join Date: Aug 2004
Location: klamazoo
Hammond 125E can't give you enough flat response, no air gap between EI lamination, try 125ESE.

Here's a new info about 1626, distortion curve,

  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
FS: 1626 Tube Amp, Van Alstine pre, tubes, crossover. xecluded Swap Meet 1 30th April 2009 07:27 AM
FS: Darling Tubes 1626/8532 RockysDad Swap Meet 1 13th February 2009 02:07 AM
Darling 1626 amp rca9449 Tubes / Valves 9 7th October 2008 05:33 PM
1626's watt? hhocean Tubes / Valves 5 28th April 2005 09:13 PM
FS... Tubes for double Darlings (1626 & 8532) RockysDad Swap Meet 2 26th January 2005 07:00 PM

New To Site? Need Help?

All times are GMT. The time now is 05:26 PM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2