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 16th January 2008, 08:11 PM   #1
diyAudio Member
 
Join Date: Dec 2007
Default Review of New S-5 K-16LS Kit

After building, troubleshooting (thanks to those who helped) and burning in of the new s-5 16 Wpc stereo amplifier kit, I want to share my thoughts for anyone who may be interested. The kit is straightforward and easy to build and comes with pretty good instructions. I decided I wanted to hear its sound mostly stock before I upgraded poly film capacitors or anything like that. The modifications I did make include:
-metal chassis
-3 prong power supply grounded to the chassis with toggle switch
-AC cooling fan
-Bigger filter caps (220 uF, 220 uF, 100 uF instead of 220, 100, 22)
-270K bleeder resistors on filter caps
-bypassed capacitors on RCA inputs with wire
-Gold-plated chassis mount RCAs and binding posts

I included the fan because I'd heard that other s-5 power transformers got pretty hot. I think this PT is a beefier one than with the k-12 and the fan is probably not necessary.
First impressions of the sound are that it has a noticeably different tone than my several run-of-the-mill solid state amplifiers. Sound is warmer and more vibrant. With the input source paused, there is very little noise and no noticeable hum even at full volume. I didn't even add any snubber capacitors yet, but I'm already satisfied. I did attach the tone control option from s-5, which I'm glad I did, as different styles of music and different recordings require some adjustment to sound good. With the proper adjustment of the tone controls, bass, treble and mid are all satisfactory. With my Klipsch Heresys, full volume exceeds comfortable listening level and bass is ample.
Keep in mind this is my first experience with tube audio and I have never heard other tube amplifiers for comparisson. Thus, I'm probably not the best person to review an amplifier for tube enthusiasts. But, I would say that, at a total investment of under $400, the amp sounds noticeably better than the $350 solid-state amplifier it is replacing.
Attached Images
File Type: gif dsc00066.gif (9.4 KB, 4470 views)
  Reply With Quote
Old 16th January 2008, 08:14 PM   #2
diyAudio Member
 
Join Date: Dec 2007
and a picture of the outside
Attached Images
File Type: gif dsc00067.gif (10.2 KB, 4258 views)
  Reply With Quote
Old 17th January 2008, 12:18 AM   #3
diyAudio Member
 
gmilitano's Avatar
 
Join Date: Apr 2004
Location: Winnipeg, Manitoba
Thanks for the info.

Do you have a scope?
  Reply With Quote
Old 17th January 2008, 12:52 AM   #4
jduffy is offline jduffy  United States
diyAudio Member
 
jduffy's Avatar
 
Join Date: Oct 2006
Nice job friend! From all of the tweaks that I've seen on various websites, you can keep playing with this for quite a while! That's a great aspect about kits that have been seriously exploited by the tweakers.
  Reply With Quote
Old 17th January 2008, 02:04 PM   #5
diyAudio Member
 
Join Date: Dec 2007
Unfortunately I don't have a scope. I'm a physics student, so there's a chance I could take it in to one of the labs and test it there. But, I don't have dummy loads either yet.
  Reply With Quote
Old 17th January 2008, 02:59 PM   #6
diyAudio Member
 
Sal Brisindi's Avatar
 
Join Date: Nov 2006
Looks nice but to tell you the truth and not to reign in on your parade, when I hear someone spending $400 on an amp like that why not buy a used Dynaco ST-70? Trust me, you can find good used ST-70 for under $400.

Regards,
Sal Brisindi
  Reply With Quote
Old 14th April 2008, 05:59 PM   #7
123rmp is offline 123rmp  United States
diyAudio Member
 
Join Date: Apr 2008
Fenpark15 -

I would like to exchange emials with you regarding your upgrades and overall experience with the 16 LS kit, but as a newbie who is "under moderation" I cannot email you from the forum.

Is it possible for you to email me via the forum?

Thx
  Reply With Quote
Old 15th April 2008, 10:39 PM   #8
dubdub is offline dubdub  United Kingdom
diyAudio Member
 
Join Date: Jan 2008
its good to see a review of tis kit-there was another one on http://diyaudioprojects.com/, but that was mainly about the results of a scope test- a description of the sound quality would of been a plus.

diyaudioprojects is a great resource (and good reading), to be fair they did ask for experiences with this kit to be shared and compared.

however a 2nd opinion was needed in my view as I think the kit is good value!
  Reply With Quote
Old 15th April 2008, 10:59 PM   #9
diyAudio Member
 
gmilitano's Avatar
 
Join Date: Apr 2004
Location: Winnipeg, Manitoba
Here are Bruce's measurements of the S-5 Electronics K-8LS Tube Amp Kit. As far as we are aware, these are the only measurements of the new kits right now. As you mention, it is important not to pass judgment based on just one set of measurements.

We have had a small handful of subjective emails, some good and some bad. Here is a link to some subjective comments about the K-8LS kit:

http://www.diyaudio.com/forums/showt...09#post1310309

These comments seem to confirm the poor response in the bass region.


Quote:
Originally posted by dubdub
its good to see a review of tis kit-there was another one on http://diyaudioprojects.com/, but that was mainly about the results of a scope test- a description of the sound quality would of been a plus.

diyaudioprojects is a great resource (and good reading), to be fair they did ask for experiences with this kit to be shared and compared.

however a 2nd opinion was needed in my view as I think the kit is good value!
  Reply With Quote
Old 20th April 2008, 09:49 PM   #10
Ben10 is offline Ben10  United Kingdom
diyAudio Member
 
Join Date: Apr 2008
Default Just Ordered One

This will be my first build. Wondering if anyone has any advice?

I am lucky enough to have access to a machine shop so I'm going to make a chasis out of aluminium.

I was thinking of making some transformer covers too. I know this is very extravagant for a cheap kit but I have access to free metal so I figured why not...

I would be interested to hear peoples ideas on chasis design.

I am going to use some decent RCA's and binding posts.

I was thinking of using chasis mount valve sockets then wiring these to the PCB. Can anyone foresee any problems with this?

Also any other weird and wonderful ideas... Throw them my way.

I want to make the most extravagant ridiculous cheap *** amp I can.
  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
K-16ls kevin.dickerson Tubes / Valves 7 27th April 2011 01:37 AM
K-16LS Help Please Madmen Tubes / Valves 6 10th December 2008 09:26 PM
S-5 K-16LS Kit arrived in Germany !! lufton Tubes / Valves 10 19th November 2008 10:59 PM
K-16LS kit Assembled and Working 123rmp Tubes / Valves 10 14th July 2008 01:21 PM
S-5 16LS tube amp use with 8 ohm speakers 123rmp Tubes / Valves 8 13th April 2008 11:40 PM


New To Site? Need Help?

All times are GMT. The time now is 06:07 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