TubeLab SimpleSe and speaker efficiency - 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 29th August 2007, 06:09 AM   #1
diyAudio Member
 
Join Date: Oct 2006
Default TubeLab SimpleSe and speaker efficiency

I have been given permission to spend a little money on a tube amp for my office at work.

Now, I do not have much to spend at all. It seems that the Tube Lab SimpleSe could be very inexpensive and can output around 10WPC.

Of course, I do not have speakers for my office and was thinking cheap and bookshelf.

Anyway, we recently put some Sony 2-way bookshelf speakers in the baby's room. He likes them and they are around $50 a pair.

Now with a 10W SimpleSE powered by iTunes via the audio jack, going into 87dB speakers, will I hear anything?

Otherwise, can anyone recommend sub $100 higher efficiency speakers.

Charlie
  Reply With Quote
Old 29th August 2007, 06:11 AM   #2
diyAudio Member
 
dsavitsk's Avatar
 
Join Date: Jan 2005
Location: Hartford
87 is fine for sensitivity, especially for an office, but check the impedance curve.
  Reply With Quote
Old 29th August 2007, 06:57 AM   #3
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Blog Entries: 5
Default Re: TubeLab SimpleSe and speaker efficiency

Quote:
Originally posted by cbutterworth
can anyone recommend sub $100 higher efficiency speakers.
Are you going to build them?

dave
__________________
community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi
p10-hifi forum here at diyA
  Reply With Quote
Old 29th August 2007, 07:39 AM   #4
arnoldc is offline arnoldc  Philippines
diyAudio Member
 
Join Date: Apr 2003
Location: Makati
Send a message via Yahoo to arnoldc
Dave, I'm interested too if what you have in mind is something I can build.
  Reply With Quote
Old 29th August 2007, 11:19 AM   #5
chrish is offline chrish  Australia
diyAudio Member
 
chrish's Avatar
 
Join Date: Oct 2003
Location: Sydney
Without the "bells and whistles", this amp would be cheap to build. I guess the big dollars would be saved by using budget output transformers and tubes. The extra filter cap and choke will only cost about $30 extra to include.

I have built this amp and absolutely love it. The design of the board and the detailed instructions on the TubeLab web site allowed me to build a very quiet (as in no hum) sweet sounding amp without really knowing much of the "tricks of the trade" in tube amp construction. I am running the budget Edcor XSE15-8-5K transformers and have found them quite good (I have active crossover and stereo bass units for <80Hz). I am running JJ ECC81 input tube and JJ E34L output tubes. I have also got some JJ KT88 tubes. After several weeks of listening, I have found that I prefer the E34Ls to the KT88s. In my setup the E34Ls sound a little more detailed. The KT88s sound louder in the bass, but in my setup and in my opinion, the bass sounds a little muddier and the highs slightly less detailed. The E34Ls also cost significantly less and offer slightly more output power in this setup.

I might add that I think that this amp would be wasted on an MP3 system, but I am biased, I love mine in my main system.

Another thing that may be worth investigating, audio pre-amps and CD players etc should not have any DC offset in their output but I am not quite so sure about MP3 players and computer soundcards. It might be worth asking some of the more knowledgeable members of this forum if they would recommend adding a capacitor to the input of the amp to protect from DC. I am currently building a little 6BM8/ECL82 push pull amp for my girlfriend ( http://www.bonavolta.ch/hobby/en/audio/ecl82_2.htm ) for exactly the same purpose you are building yours and have decided to add a capacitor to the input just in case her iPod or computer has some DC (this was on the recommendation of my father, an electronics engineer).

If you do decide to build this amp please leave some feedback for the forum and for TubeLab. I think George has sold a few of the boards but have not seen much feedback on the forum or on his site.

Cheers,

Chris
  Reply With Quote
Old 29th August 2007, 02:06 PM   #6
Sherman is offline Sherman  United States
diyAudio Member
 
Join Date: Feb 2004
Location: Chicago area
Default Re: TubeLab SimpleSe and speaker efficiency

Quote:
Originally posted by cbutterworth
...

Now with a 10W SimpleSE powered by iTunes via the audio jack, going into 87dB speakers, will I hear anything?

Otherwise, can anyone recommend sub $100 higher efficiency speakers.

Charlie

Charlie,

In my family room system I have SE KT88 amps putting out about 7 watts. I am using Dynaco A25s in that setup and it goes plenty loud for me in that room. (Room is about 13 feet by 17 feet with an 8 foot ceiling and an 8 foot opening into the next room.) I don't know the efficiency of the Dynacos but I would guess no more than 89dB.

I've also used those same amps with Advent /1 speakers which are slightly less efficient and probably about the same as yours. I found that for almost all the music I listen to they were also quite loud enough.

In an office 10WPC would be plenty I think.
__________________
--Sherman
  Reply With Quote
Old 29th August 2007, 07:05 PM   #7
diyAudio Member
 
Join Date: Oct 2006
Great replies - Thanks!

I have just invested a chunk of change on a Cornet2 phono-pre from Jim Hagerman. I used premium parts for signal caps, etc., so the cost was quite substantial ($400 - $500), but it's worth it. I expect that my Aikido pre cost a similar amount, although I am less sure, it may have cost quite a bit less.

Having had six months of vacuum tubes in my system, I have decided that I love them. My main amp is a 55W solid state AKSA 55N. This is supposed to be a very high quality amp and has a solid DIY following. This, coupled with lack of space means that a vacuum-tubed main amp for my home system is out of the question. Hence one for my office.

When I mentioned this to my wife, I was expecting a "go shove it" instead, I got a "go for it"

I have always planned for some music in my office. As a scientist, I need to keep myself well-read on current articles. I already have a comfy reading chair, and the thought of some nice sounding music should really inspire me to spend a hour each day catching up on the latest.

Anyway, $200-300 on an amp and up to $100 for speakers could be justified. Maybe if the SimpleSE sounds really good, I'll be allowed to keep it at home and invent a way of adding it to my home system alongside my solid-sate power amp (to which I feel some loyality).

Yes, I could build some speakers, if less than $100.

Regards,
Charlie
  Reply With Quote
Old 29th August 2007, 10:50 PM   #8
diyAudio Member
 
tubelab.com's Avatar
 
Join Date: Jul 2005
Location: West Virginia panhandle
The SimpleSE and all of my amplifiers were developed and tested with 87db Yamaha NS-10M studio monitors. These are not the most tube friendly speakers in the world. The volume level in my 10 X 11 foot lab is loud. Not extremely loud, but loud. Loud enough to annoy Sherri in the other end of the house with the doors closed. I can't imagine an office where this setup wouldn't generate enough sound. I routinely listen to a TubelabSE with 45's or a low powered SimpleSE with trioded 6V6's through these speakers. Both amps make about 1.5 watts. This is not loud, but adequate for comfortable listening.

Quote:
Another thing that may be worth investigating, audio pre-amps and CD players etc should not have any DC offset in their output but I am not quite so sure about MP3 players and computer soundcards.
I am now using an EMU 1212 24 bit 192 KHz sound card for most of my music playing. It works great. I have also used a M-audio Audiophile 2496 card. I am slowly ripping my entire CD collection to disc using exact audio copy. The sound is better than my CD player. I have no experience with MP3 players. Many SS amps really hate DC offset, so I imagine any "line output" should be OK. Some headphone outputs may have a small offset without a headphone load, but a few millivolts won't bother the SimpleSE.

Quote:
If you do decide to build this amp please leave some feedback for the forum and for TubeLab. I think George has sold a few of the boards but have not seen much feedback on the forum or on his site.
Chris: I have sold about 60 boards total. Several people have emailed me saying that they have finished their amps, but you are the only person to send pictures of a completed amp. I recently got a picture of a board fired up and working (trioded 6V6 again), but haven't had time to post it yet.
__________________
Too much power is almost enough! Turn it up till it explodes - then back up just a little.
  Reply With Quote
Old 29th August 2007, 11:00 PM   #9
diyAudio Member
 
Join Date: Oct 2006
OK, so how do I order? Who do I pay? How much do I pay?

Charlie
  Reply With Quote
Old 30th August 2007, 12:40 AM   #10
diyAudio Member
 
tubelab.com's Avatar
 
Join Date: Jul 2005
Location: West Virginia panhandle
Blank PC boards are $35 and shipping is $8 in the US. You do not have the email feature enabled through this forum, so I can't send you email. Email me and I will forward you the ordering info. My email address is at the bottom of my home page, and I am attempting to include it here.

Never put your email address in text format in a public forum. The evil spam robots will find it and bomb your email box with junk.
Attached Images
File Type: jpg email.jpg (3.7 KB, 558 views)
__________________
Too much power is almost enough! Turn it up till it explodes - then back up just a little.
  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
Another TubeLab SimpleSE Build nic6paul Tubes / Valves 91 13th June 2009 04:16 AM
FS Tubelab SimpleSE all parts or assembled nvrgdenuf Swap Meet 0 6th April 2009 01:40 AM
Tubelab web site down, no more SimpleSE tubelab.com Tubes / Valves 35 30th May 2008 07:38 PM
Tubelab SimpleSE chrish Tubes / Valves 39 8th May 2008 02:09 AM
Tubelab some simpleSE related Qs mashaffer Tubes / Valves 5 26th January 2008 03:44 AM


New To Site? Need Help?

All times are GMT. The time now is 09:05 PM.


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