Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki 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

Trying to choose new tubes for an Elekit TU-8200 amplifier
Trying to choose new tubes for an Elekit TU-8200 amplifier
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 13th August 2017, 04:48 PM   #1
HarryY is offline HarryY  United States
diyAudio Member
 
HarryY's Avatar
 
Join Date: Aug 2017
Location: NY
Trying to choose new tubes for an Elekit TU-8200 amplifier
Default Trying to choose new tubes for an Elekit TU-8200 amplifier

I recently built an Elekit TU-8200 amplifier for my Den/Home office.
I have the speakers on each end of my desk about 3 feet away from me.

The amp came with Chinese 12AU7's and Russian Electro-Harmonix 6L6EH tubes.
The amplifier will take a variety of power tubes: 6L6GC, EL34, KT66, KT88 6550 & KT90

As for budget probably about $300 for the power tubes.

I know some like the KT66 and KT88 as they tend to give a fuller sound
(I'm looking for a fuller sound) while others prefer NOS GE & Sylvania 6L6GC.

So my question is what tube I should be looking at?

A secondary question what brand of 12AU7
should I look at to replace the stock 12AU7?

Thank you
  Reply With Quote
Old 13th August 2017, 05:21 PM   #2
petertub is online now petertub  Sweden
diyAudio Member
 
Join Date: Jul 2015
Location: gothenburg,sweden
Trying to choose new tubes for an Elekit TU-8200 amplifier
other speakers might make more of a difference
__________________
My home is at www.tubular-well.se
  Reply With Quote
Old 13th August 2017, 05:24 PM   #3
HarryY is offline HarryY  United States
diyAudio Member
 
HarryY's Avatar
 
Join Date: Aug 2017
Location: NY
Trying to choose new tubes for an Elekit TU-8200 amplifier
Quote:
Originally Posted by petertub View Post
other speakers might make more of a difference
Speakers are in the works (waiting for them to be shipped)
  Reply With Quote
Old 13th August 2017, 05:36 PM   #4
45 is offline 45  Italy
diyAudio Member
 
45's Avatar
 
Join Date: Dec 2008
Location: UK
Well, with $300 you can buy both one pair of good quality current production KT66 and one pair of NOS 6L6GC.

Current KT66, I would go for Gold Lion or, if you can still find them, the Valve Art (these were made with original GEC tools to high standard, a true quality copy). Just make sure they are really selected and performing as premium tubes.
I would stay away from NOS KT66 as there are a lot of fakes around....

For 12AU7 the choice among NOS is almost endless and prices are still acceptable.
  Reply With Quote
Old 13th August 2017, 05:42 PM   #5
audiowize is offline audiowize  United States
diyAudio Member
 
Join Date: Aug 2005
Location: Seattle
Send a message via AIM to audiowize
Yeah, those OT's look like they are probably good for 2-3 Watts. Select your speakers accordingly.

The feedback loop around the amplifier will tend to neutralize the differences between tubes, other than perhaps the 12AU7. There are oodles of nice, used old stock 12AU7's available on eBay for a few bucks a piece.
  Reply With Quote
Old 13th August 2017, 05:54 PM   #6
45 is offline 45  Italy
diyAudio Member
 
45's Avatar
 
Join Date: Dec 2008
Location: UK
Quote:
Originally Posted by audiowize View Post
Yeah, those OT's look like they are probably good for 2-3 Watts. Select your speakers accordingly.
They seem to be a bit small for full nominal power at low frequency but otherwise are ok.

Some measurements here:
Elekit TU-8200 Tube Amp Review
  Reply With Quote
Old 13th August 2017, 07:29 PM   #7
kevinkr is offline kevinkr  United States
diyAudio Moderator
 
kevinkr's Avatar
 
Join Date: Sep 2004
Location: Boston, Massachusetts
Trying to choose new tubes for an Elekit TU-8200 amplifier
Surprisingly decent sounding little amp for this sort of application. I've heard several, of the tube combinations I've heard in this amp KT88s were about the best sounding, followed by the KT66. 6L6 were OK, but the others clearly sounded better.

Try Mazda (French) ECC82/12AU7A for the small signal end of things.
__________________
"To argue with a person who has renounced the use of reason is like administering medicine to the dead." - Thomas Paine
  Reply With Quote
Old 13th August 2017, 07:31 PM   #8
45 is offline 45  Italy
diyAudio Member
 
45's Avatar
 
Join Date: Dec 2008
Location: UK
Quote:
Originally Posted by audiowize View Post
Yeah, those OT's look like they are probably good for 2-3 Watts. Select your speakers accordingly.

The feedback loop around the amplifier will tend to neutralize the differences between tubes, other than perhaps the 12AU7. There are oodles of nice, used old stock 12AU7's available on eBay for a few bucks a piece.

I actually have plenty of volume, even into a old pair of RCA Branded Minimus 7's.

Quote:
Originally Posted by kevinkr View Post
Surprisingly decent sounding little amp for this sort of application. I've heard several, of the tube combinations I've heard in this amp KT88s were about the best sounding, followed by the KT66. 6L6 were OK, but the others clearly sounded better.

Try Mazda (French) ECC82/12AU7A for the small signal end of things.
Measurements in the link above also look good with the exception of distortion at low frequency. But that is normal for that small transformer.
It also works well with speakers that I would never use with a valve amp. With that roller coaster impendance with 3 huge peaks over the full range 1-1.5dB deviation from flat response is not bad at all.

Quote:
Originally Posted by 45 View Post
Measurements in the link above also look good with the exception of distortion at low frequency. But that is normal for that small transformer.
It also works well with speakers that I would never use with a valve amp. With that roller coaster impendance with 3 huge peaks over the full range 1-1.5dB deviation from flat response is not bad at all.

I'll admit I took a chance ordering the kit, I enjoy building kits (mostly for Amateur radio).

The reviews looked good so I took the chance. Admittedly I breathed a sigh of relief
once it was done since I was concerned it was not going to have enough volume for me.
  Reply With Quote
Old 13th August 2017, 11:03 PM   #9
45 is offline 45  Italy
diyAudio Member
 
45's Avatar
 
Join Date: Dec 2008
Location: UK
Quote:
Originally Posted by HarryY View Post
I'll admit I took a chance ordering the kit, I enjoy building kits (mostly for Amateur radio).

The reviews looked good so I took the chance. Admittedly I breathed a sigh of relief
once it was done since I was concerned it was not going to have enough volume for me.
If I were in your position I would first find good speakers and eventually after change tubes. For good speakers I mean mainly those with with flat impendace, well balanced and with sufficient efficency. High efficiency is necessary for really load volume but not necessary in general. It also depends on how you listen to music and the kind of music of course.
  Reply With Quote
Old 13th August 2017, 11:08 PM   #10
HarryY is offline HarryY  United States
diyAudio Member
 
HarryY's Avatar
 
Join Date: Aug 2017
Location: NY
Trying to choose new tubes for an Elekit TU-8200 amplifier
I wound up ordering a pair of cabinets from Planet 10 (a vendor here).

The drivers will be Full range by Mark Audio (Alpair 7) with 85 dB sensitivity.
  Reply With Quote

Reply


Trying to choose new tubes for an Elekit TU-8200 amplifierHide 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
Elekit TU-8200 vkung Elekit 8 13th April 2019 01:10 PM
Elekit 8200 Tube rolling Mancave62 Elekit 15 22nd December 2017 04:07 AM
FS: Elekit TU-8200 tube amplifier fully built brollyman Swap Meet 1 5th June 2016 03:20 PM
Tube guards/cage for Elekit TU-8200 brollyman Parts 0 27th January 2016 03:54 PM
Elekit TU-8200 vkung Elekit 1 8th October 2013 05:43 PM


New To Site? Need Help?

All times are GMT. The time now is 03:03 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio
Wiki