Quicksilver KT88 mono 60watt amp schematic - Page 2 - 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
Reply
 
Thread Tools Search this Thread
Old 14th December 2002, 11:40 PM   #11
diyAudio Senior Member
 
fdegrove's Avatar
 
Join Date: Aug 2002
Location: Belgium
Default GENIE IN A BOTTLE

Hi Joe,

There are ways but that really would require your acceptance of Moore's law.
Look,here is what I did for a dealer in Brussels many years ago:

The man being totally enamoured with the amps,even more so after a first mod, asked me what I would do to make them better still.

Listen good,it pays:

I told him it was going to cost him at least 250$ per mono block.
He accepted it and I went to work,all tube sockets were replaced with ceramic insulated ones and gold plated triple contact ones (you wont find these anymore,only 13.000 were made for us on special order by Schurter in Switzerland).

Any Russian ceramic octal and noval socket is very good though.

Next,all soldering supports were replaced with ceramic ones with silvered contacts.
Every passive component was removed and replaced with the same value but tighter tolerance and wirewrapped and soldered with leadfree high silver content solder.
All tubes were tightly matched and biased while taking OPT inbalance into account.

Any wiring was replaced with the best silver wire.

All PSU caps were upgraded by the best we could find,105*C Nichicons matched for equal and lowest ESR possible.
The amps were then burned in for a week.

The man payed the bill and sold all of them a month later at 500$ over regular price.

A month later we got 50 Jadis amps of all kinds,Ja30,60 to 200 in for a similar upgrade.

I say this was a lot of work but it did put the company on the map worldwide!

And that was 1989 or thereabout....
A year later we had the Japanese ringing the doorbell.

I'm convinced that a lot of our members can tell you similar stories.
Bottom line is...do you really want to push things that far?

Ciao,
__________________
Frank
  Reply With Quote
Old 14th December 2002, 11:49 PM   #12
halojoy is offline halojoy  Sweden
On Hiatus
 
Join Date: Nov 2002
Default as if I could save time in a bottle ....

Jim Croce - the indian
"Very Best Of" BR Music - BR 142-2

Time In A Bottle 2:24

I have bought this CD
  Reply With Quote
Old 15th December 2002, 06:30 AM   #13
halojoy is offline halojoy  Sweden
On Hiatus
 
Join Date: Nov 2002
Default Re: as if I could save time in a bottle ....

Quote:
Originally posted by halojoy
Jim Croce - the indian
"Very Best Of" BR Music - BR 142-2

Time In A Bottle 2:24

I have bought this CD
anybody has got some spare time?
  Reply With Quote
Old 15th December 2002, 12:20 PM   #14
diyAudio Member
 
Join Date: Nov 2002
Frank


To be honest I'm looking for mods that can give measureable results. I guess I can't subscribe to a mod unless it can be shown to provide measureable results. Years ago I went thru the typical tweeks that some of us SS guys suffered. The perfect capacitors with copper leads that had to be of a specific composition that someone thought would bring sonic joy. The bypass caps on every electrolytic cap in the signal path. The additional caps in the power supply with a soft start so one didn't turn the lights out in the house when you turned on the amp. Yes, we can't forget the wonder solder. Where does it all end? I put everything one could imagine into my amps until one day when I decided to measure the difference between a modified amp and a stock amp. That indeed was a scary day that proved no measurable increase in performance, no decrease in THD or IMD. When I could no longer obtain pleasure from any piece I went on a new kick, I built my own amp, a toy that laughed at any load presented and asked for more.

Where does it end?


Attached Images
File Type: jpg p9270023.jpg (81.2 KB, 2240 views)
  Reply With Quote
Old 15th December 2002, 12:29 PM   #15
GaryB is offline GaryB  United States
diyAudio Member
 
Join Date: Sep 2002
Location: Silicon Valley
Default Quicksilver 8417 schematic

I don't know about the KT88 amp, but I used to own one of the 8417 amps. It was a nice simple amp, although its power supply had too much capacitance for the GZ34 rectifier. Based on the picture you posted, they look to be very similar. You can find the schematic on C. Bonavolts site.
---Gary
Attached Images
File Type: jpg qs8417amp.jpg (53.0 KB, 2075 views)
  Reply With Quote
Old 15th December 2002, 12:40 PM   #16
GaryB is offline GaryB  United States
diyAudio Member
 
Join Date: Sep 2002
Location: Silicon Valley
Default 8417-KT88 Changes

Ned of Triode electronics has published a small blurb explaining how to convert an 8417 amp to KT88. It also contains useful suggestions on fixing problems with the original 8417 amp. In a nutshell, the 8417 amp used too much capacitance for the GZ34 rectifier. It also used somewhat underrated coupling caps to the output tubes. And it used too high a value of grid resistance for the 8417, which made it useable only with certain brands of 8417. Take a look at:
http://www.triodeel.com/8417.htm

---Gary
Attached Images
File Type: jpg qs8417ps.jpg (43.2 KB, 1523 views)
  Reply With Quote
Old 15th December 2002, 12:56 PM   #17
diyAudio Member
 
Join Date: Nov 2002
Gary

Thanks for the information here. Would you happen to have a link to the C. Bonavolts site?


Joe
  Reply With Quote
Old 15th December 2002, 02:50 PM   #18
diyAudio Member
 
Brett's Avatar
 
Join Date: Jan 2002
Quote:
Originally posted by burnedfingers
Would you happen to have a link to the C. Bonavolts site?
http://www.bonavolta.ch/hobby/en/audio/index.html
  Reply With Quote
Old 15th December 2002, 04:20 PM   #19
diyAudio Member
 
Join Date: Nov 2002
I don't seem to find the schematic for the Quicksilver KT88.
  Reply With Quote
Old 15th December 2002, 05:31 PM   #20
diyAudio Member
 
dshortt9's Avatar
 
Join Date: Apr 2001
Location: Milwaukee, Wisconsin
I only see the 8417 schematic. As far as a modification, how about partial cathode coupling by grounding the 4 ohm tap and running the cathodes of the output tubes through the common and 16 ohm taps? Then reduce the feedback. See this link http://www.montagar.com/~patj/mi12188a.htm
  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
PP KT88 Mono blocks? TubeMack Tubes / Valves 38 11th June 2009 05:41 PM
Quicksilver 300b monoblock (KT88 conversion) eleakist Tubes / Valves 4 18th June 2007 11:50 AM
Quicksilver mini mono block amps? Original Burnedfingers Tubes / Valves 2 15th March 2006 11:47 AM
Quicksilver Mono 60 upgrades labjr Tubes / Valves 4 16th February 2005 02:21 PM
For Sale: Quicksilver Horn Mono's BHD Swap Meet 1 10th September 2004 02:18 AM


New To Site? Need Help?

All times are GMT. The time now is 06:21 AM.


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