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2359glenn | studio - Page 746

post #11176 of 14658

Lundahl is not cheap and KnK Audio is the only US distributor.  Speaking from experience.

post #11177 of 14658

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Edited by MoatsArt - 4/13/15 at 4:53pm
post #11178 of 14658

They are the best transformers though

post #11179 of 14658

There will be no more rectifier rolling anymore no 5 volt or 3.3 volt rectifiers.

I will be using TV damper diode tubes 42EC4 or SS rectifiers.

post #11180 of 14658
Quote:
Originally Posted by 2359glenn View Post
 

There will be no more rectifier rolling anymore no 5 volt or 3.3 volt rectifiers.

I will be using TV damper diode tubes 42EC4 or SS rectifiers.

Glenn....will my amp be this way

post #11181 of 14658
Quote:
Originally Posted by whirlwind View Post
 
Quote:
Originally Posted by 2359glenn View Post
 

There will be no more rectifier rolling anymore no 5 volt or 3.3 volt rectifiers.

I will be using TV damper diode tubes 42EC4 or SS rectifiers.

Glenn....will my amp be this way


It could be I already have your transformer but you can go Lundahl if you want to pay

the extra $300

post #11182 of 14658
Quote:
Originally Posted by 2359glenn View Post
 
Quote:
Originally Posted by whirlwind View Post
 
Quote:
Originally Posted by 2359glenn View Post
 

There will be no more rectifier rolling anymore no 5 volt or 3.3 volt rectifiers.

I will be using TV damper diode tubes 42EC4 or SS rectifiers.

Glenn....will my amp be this way


It could be I already have your transformer but you can go Lundahl if you want to pay

the extra $300

pm coming your way!

post #11183 of 14658
Quote:
Originally Posted by 2359glenn View Post
 

They are the best transformers though

 

Agree.  Going with Lundahl and you won't regret....

post #11184 of 14658

I am thinking of doing a redesign concentrating on a total black background

It seems that is most important of all things hearing nothing. 

Running tube heaters on DC.   


Edited by 2359glenn - 3/26/15 at 5:52pm
post #11185 of 14658

.


Edited by MoatsArt - 4/13/15 at 4:53pm
post #11186 of 14658
Quote:
Originally Posted by Xcalibur255 View Post
 

 

I guess that explains why I see higher prices on the Lorenz and why they are more rare.  To be honest it doesn't look like a superior tube to my eyes.  The mica are in contact with the glass due to those wing tabs, which will make the tube more prone to microphonics induced by mechanical vibration.  And the Siemens has a zirconium getter where as the Lorenz does not.  I know the Siemens tube uses gold wire for its control grid too.  It's hard to tell in the photo but it appears the Lorenz may not.

 

The C3g was the pinnacle of tube engineering in some ways.  These tubes sold for more money back in their day than they do now.  Adjusted for inflation they were crazy expensive when they were relevant due to the exotic materials and construction techniques in them.

 

Fortunately, I managed to get these for $20 each, and at that price, felt that they were certainly worth trying. In terms of construction, the Lorenz may not be as good as the Siemens, but after about 10 hours, I hear no indications that they are microphonic. Mine are very quiet.

post #11187 of 14658
Quote:
Originally Posted by gibosi View Post
 

 

Fortunately, I managed to get these for $20 each, and at that price, felt that they were certainly worth trying. In terms of construction, the Lorenz may not be as good as the Siemens, but after about 10 hours, I hear no indications that they are microphonic. Mine are very quiet.

 

Not necessarily audible microphonics, but one of the reasons why tubes vary a little bit from one to another is because of variations in their mechanical damping.  This is why people say some TS BGRP are "more magical" than others because of the tensioning of the mica supports varying.  The implication is that the Lorenz might be a bit less resolving, but I'm kind of just floating this as theory here and definitely not asserting it as fact.

post #11188 of 14658
Quote:
Originally Posted by 2359glenn View Post
 

I am thinking of doing a redesign concentrating on a total black background

It seems that is most important of all things hearing nothing. 

Running tube heaters on DC.   

 

Sorry, Glenn.  I didn't realize I would start something with my comment.  I know how you feel about people expecting tube gear to be 100% silent all the time.  To clarify my own position it's not presence of the background hum itself that I consider bad, the slight hum in my OTL doesn't bother me when no music is playing.  But that hum negatively impacts the amps ability resolve very fine/small details in the music, sort of how you can't see fine details on your TV when there is static so I believe it's a noble cause to try and get that noise floor down as much as possible. 

 

But I'm obsessed with transparency, some people aren't as analytical as I am about this.  It also erodes the value proposition of the amp by raising the price a lot in order to achieve a small gain in return.  I feel I should really stress this point to everybody who is having an amp built right now.  So hopefully with this post I'm balancing both sides of the situation a little bit better in terms of perspective.

post #11189 of 14658

The spacing of the elements within a tube affect the sound characteristics amongst other factors.

post #11190 of 14658

My thoughts on the Llundahl transformers for OTL I mentioned earlier on as a possible upgrade.

 

However good they are I don't think one can achieve 100% dark background unless circuit dampening is used as well.

 

The quality of the tubes is critical no mater what.

By quality I don't necessarily mean one needs to spend a lot to get quality tubes.

 

High Frequency AC may also be an alternative for the heater supply.

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