Vacuum Tube OTL power amp!! - Page 32

M Gregg · 27th October 2011, 10:13 PM

Quote:

Originally Posted by Alastair E

I reckon those tubes should be pretty well matured by now, with what you've been feeding 'em!....

How's it sounding?

Sounds great!

It sounds smooth and detailed loads of very deep bass. It is very natural sounding no hiss or spit. One of the things I notice is that all the "sounds" on the recording seem to be at the correct level. What I mean is that on some amps you seem to get selective frequency attenuation. So some of the details are lost. I guess this is the O/P Tx.

Regards
M. Gregg

M Gregg · 27th October 2011, 10:17 PM

Quote:

Originally Posted by Alastair E

I would be interested to see your HT reg, Flatheadmurre....

A circuit diagram would be interesting!

Regards
M. Gregg

Alastair E · 10:24 PM

Ah--Thats great! I'm happy that after all the effort you have put into it and your excellent construction has paid off....

Superb build I must add....

I only ask your impressions, on its sound, as those who listen to mine,--while impressed, are not what you may call 'audiophiles' and have little idea of the more technical aspects of amplification....

--To some of them, a boom-box sounds good!

Nice to have a good ear check it out--all be it by 'proxy' as it were!

Without going into audiophile gobbledegook, I find the sound extremely Clear,--Defined-- Things you cant sometimes hear are audible, and those things are usually pretty subtle--Sorta you can easily understand what the backing-singers are singing, without having to conciously listen to them...
Hard to describe.....

Maybe it is as you say--a selective attenuation by combos of amps/speakers, who knows....

M Gregg · 10:37 PM

I find that the volume is more than I need with one heater running!

Only thing is once on it sort of stays on..LOL

Listening to female vocals shows lots of detail, you can hear them breath as they sing!
Also you can hear room acoustics. "Echo" ect.
Also accents of singers are easy to pick out!
You can hear the skin on drums /tom tom etc

This kind of information is normaly linked to Higher end SS equipment.

Regards
M. Gregg

Alastair E · 27th October 2011, 10:32 PM

Over the last year or so, and as you know--many mods ad updates, I usually play the TV sound through the amp...

While in a lot of cases TV sound--even digital-- Isnt good, over time you can get a pretty good impression of an amps deficiencies and other issues.

Some things transmitted, just show distortions so clearly--even though on a good source, everything sounded just fine,--I have no idea why, but wasn't happy until I sorted that completely etc...

Guess thats why I havent up until now made a Proper finished build,-- Too busy getting it as Right as I could...
Pretty happy now with it,--Just that last thing to try.....

M Gregg · 27th October 2011, 10:47 PM

Quote:

Originally Posted by Alastair E

Over the last year or so, and as you know--many mods ad updates, I usually play the TV sound through the amp...

While in a lot of cases TV sound--even digital-- Isnt good, over time you can get a pretty good impression of an amps deficiencies and other issues.

Some things transmitted, just show distortions so clearly--even though on a good source, everything sounded just fine,--I have no idea why, but wasn't happy until I sorted that completely etc...

Guess thats why I havent up until now made a Proper finished build,-- Too busy getting it as Right as I could...
Pretty happy now with it,--Just that last thing to try.....

The problem with tweaking is you can end up with something that tends to favour a particular type of music ie great for solo singers rubbish for rock, Good for soul rubbish for acoustic.

By using the source TV you have not favored a particular type of music or sound.
This shows all types of music I have played have sounded good! No one type favored over another!

Regards
M. Gregg

flatheadmurre · 28th October 2011, 11:53 AM

The good impressions from M Gregg make me really look forward to getting this one working.

Only disadvantage with nice looking amps is that they have a bad habit of wondering out the door with some friend that likes them to.

Right now it´s very quite with only a PCL82 SEPP contraption supplying the music.

Alastair E · 28th October 2011, 12:14 PM

Ah--Lovely! A PCL82, One of my old favorates....

Bet it sounds nice though....!

flatheadmurre · 28th October 2011, 01:36 PM

PCL 82 is a very nice tube used it every way around SE PP SEPP and it performs well.

A local surplus dealer sells Siemens PCL82 in boxes of 100 for lunchmoney

.

Together with 9/18v toroid and salvaged computer PSU it´s the nr 1 givaway amp.

No toroids and itch for building has made me dig out some humming sins from the past that needs attention.

Next in line is a 6aq5/ecc81 compactliving humplifier that need major resomething .

M Gregg · 28th October 2011, 03:10 PM

Just for fun

The snow goose...OTL / Alpair bashing time.

http://www.youtube.com/watch?v=L-R1msqpRoU

3Hrs

Regards
M. Gregg

27th October 2011, 10:19 PM	#313
Alastair E diyAudio Member Join Date: Feb 2004 Location: South Wales	Ah--Thats great! I'm happy that after all the effort you have put into it and your excellent construction has paid off.... Superb build I must add.... I only ask your impressions, on its sound, as those who listen to mine,--while impressed, are not what you may call 'audiophiles' and have little idea of the more technical aspects of amplification.... --To some of them, a boom-box sounds good! Nice to have a good ear check it out--all be it by 'proxy' as it were! Without going into audiophile gobbledegook, I find the sound extremely Clear,--Defined-- Things you cant sometimes hear are audible, and those things are usually pretty subtle--Sorta you can easily understand what the backing-singers are singing, without having to conciously listen to them... Hard to describe..... Maybe it is as you say--a selective attenuation by combos of amps/speakers, who knows.... __________________ Das Beste Oder Nichts Last edited by Alastair E; 27th October 2011 at 10:24 PM.

27th October 2011, 10:21 PM	#314
M Gregg diyAudio Member Join Date: Jun 2010 Location: UK	I find that the volume is more than I need with one heater running! Only thing is once on it sort of stays on..LOL Listening to female vocals shows lots of detail, you can hear them breath as they sing! Also you can hear room acoustics. "Echo" ect. Also accents of singers are easy to pick out! You can hear the skin on drums /tom tom etc This kind of information is normaly linked to Higher end SS equipment. Regards M. Gregg __________________ What is the sound of one hand clapping? Last edited by M Gregg; 27th October 2011 at 10:37 PM.

27th October 2011, 10:32 PM	#315
Alastair E diyAudio Member Join Date: Feb 2004 Location: South Wales	Over the last year or so, and as you know--many mods ad updates, I usually play the TV sound through the amp... While in a lot of cases TV sound--even digital-- Isnt good, over time you can get a pretty good impression of an amps deficiencies and other issues. Some things transmitted, just show distortions so clearly--even though on a good source, everything sounded just fine,--I have no idea why, but wasn't happy until I sorted that completely etc... Guess thats why I havent up until now made a Proper finished build,-- Too busy getting it as Right as I could... Pretty happy now with it,--Just that last thing to try..... __________________ Das Beste Oder Nichts

28th October 2011, 12:14 PM	#318
Alastair E diyAudio Member Join Date: Feb 2004 Location: South Wales	Ah--Lovely! A PCL82, One of my old favorates.... Bet it sounds nice though....! __________________ Das Beste Oder Nichts

28th October 2011, 03:10 PM	#320
M Gregg diyAudio Member Join Date: Jun 2010 Location: UK	Just for fun The snow goose...OTL / Alpair bashing time. http://www.youtube.com/watch?v=L-R1msqpRoU 3Hrs Regards M. Gregg __________________ What is the sound of one hand clapping?


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28th October 2011, 11:53 AM	#317
flatheadmurre diyAudio Member Join Date: Mar 2011 Location: Jarna	The good impressions from M Gregg make me really look forward to getting this one working. Only disadvantage with nice looking amps is that they have a bad habit of wondering out the door with some friend that likes them to. Right now it´s very quite with only a PCL82 SEPP contraption supplying the music.

28th October 2011, 01:36 PM	#319
flatheadmurre diyAudio Member Join Date: Mar 2011 Location: Jarna	PCL 82 is a very nice tube used it every way around SE PP SEPP and it performs well. A local surplus dealer sells Siemens PCL82 in boxes of 100 for lunchmoney . Together with 9/18v toroid and salvaged computer PSU it´s the nr 1 givaway amp. No toroids and itch for building has made me dig out some humming sins from the past that needs attention. Next in line is a 6aq5/ecc81 compactliving humplifier that need major resomething .

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