Filament supply modules.

If they glow, this is the place to be
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Nick
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#211

Post by Nick »

What I will say though.

If I need any more DHT filament supplies (apart from 833a Wink) they would be of Mikes type. Laughing
But if thats based on no direct comparison to any other type?
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#212

Post by ed »

Nick wrote:
What I will say though.

If I need any more DHT filament supplies (apart from 833a Wink) they would be of Mikes type. Laughing
But if thats based on no direct comparison to any other type?
gpwm....that leads to a very obvious question
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#213

Post by pre65 »

I perceive Mikes DIY supply to be at least equal to my Tentlab modules, but as stated I have not done a comparison. On PT15 I thought there was a definite improvement, but that was over a simple current regulated supply.

I already have some 18V transformers and 62mh chokes as in my first attempt so there is a cost benefit to be taken into account.

So, for me, that is my personal opinion.

My powers to hear, and describe audio changes/differences are severely limited, so sometimes I just prefer a certain thing without being able to say exactly why. That's just me I'm afraid. :?
Last edited by pre65 on Fri Feb 11, 2011 1:13 pm, edited 1 time in total.
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#214

Post by pre65 »

ed wrote:
Nick wrote:
What I will say though.

If I need any more DHT filament supplies (apart from 833a Wink) they would be of Mikes type. Laughing
But if thats based on no direct comparison to any other type?
gpwm....that leads to a very obvious question
So obvious that I can't think what it is. :wink:
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#215

Post by Nick »

You sig could be a clue.
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#216

Post by pre65 »

Nick wrote:You sig could be a clue.
OK. :lol:

But I like what I like, that's not a problem I hope ? :wink: :wink:
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#217

Post by Nick »

No of course not, I was just making the point that your reply could have been interpreted as a reply to the previous question of Ian's. Clearly it wasn't because you had not made the comparison. (as you said).
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#218

Post by Andrew »

If Mike want's to loan me one I can measure it, if he likes?

I have a spectrum analyser that's AC coupled and can easily compare to a LM317 current source I use on my 300B.

cheers,

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Mike H
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#219

Post by Mike H »

All I got is 1 prototype which I'm using. Tho think we mean compare it against a tentlab et al, so which will also have to be measured :?:

 
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#220

Post by Mike H »

Appendix ~ although it's not just a case of supply noise filtering, it's also the AC impedance across the filament that prevents (or lessens as the case may be) "loss of signal current from the filament". How you go about measuring that I'm not quite sure

 
 
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#221

Post by Andrew »

Can do that too, or I could bring kit to Owston? And we could do it after it gets quieter, later in the evening? Assuming the dates work etc.

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#222

Post by Andrew »

Mike H wrote:Appendix ~ although it's not just a case of supply noise filtering, it's also the AC impedance across the filament that prevents (or lessens as the case may be) "loss of signal current from the filament". How you go about measuring that I'm not quite sure

If its in here, we can do it.

http://www.audiotester.de/Aud30FeaturesEng.pdf

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#223

Post by pre65 »

The ones I'm using on PT15 are separate to the amp itself and connected with jumper leads, so not too difficult to connect up to another amp.

Remind me the week before Owston and I will get it set up.
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#224

Post by Mike H »

There's an offer you can't refuse. :D

I guess what you're looking for then is AC across the filament, including when moosik is going through.

 
 
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#225

Post by pre65 »

If the test piece had 4mm sockets connected to the filaments then it would be a lot quicker to connect it all up.
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