Your all time favourite tube pre

[analag]

You want to know if I'm familiar with HV PSU design...I got it down almost to a science whether it be all tube or hybrid or all SS. I even have a handful of the HIP5600 high voltage (400V) three terminal regulators.
PSU can affect the performance of the piece in so many ways.... Take a tube rectifier it can make the amp sound more liquid, enhance 3D imagery etc. better than any SS rectifier can....and I don't care what the big shots have to say about it, what I hear is what I know. Some things in tube electronics defies explanation, not even SPICE can accurately model it.

Analag

 

[Peter Simonsen]

Have you ever compared it to some well known commercial unit?

Yes..PM me if you want to know which *S*

How do they vary in terms of the sound?

Like anything else..they vary because of the difference in design...too big a subject and further more ..maybe a too personal subject to talk about..seen it too often..it more often than not turns real ugly :wink: and I really dont want to go down that road.*S* not to mention misuse the time and energy..of the very fine people around here.. :green:

Kind regards

Peter

 

[mcs]

[quote author="CJ"]The 5687/2C51 type, which everyone curses because people rebrand them as 6386's, can be used for audio.[/quote]
I guess you mean the 5670/2C51. And yes, they can be used for audio :grin:

There are some 12V heater versions also - can anybody remember the type numbers?

Best regards,

Mikkel C. Simonsen

 

[Learner]

[quote author="analag"]You want to know if I'm familiar with HV PSU design...I got it down almost to a science whether it be all tube or hybrid or all SS. I even have a handful of the HIP5600 high voltage (400V) three terminal regulators. [/quote]

Hey Analag,
That sounds GREAT!!

Care to toss up a simple design for all the newbies? :grin:
Preferably a simple SS design with good reliability and capacity to sink current, and a good stability of output voltage if that's not too much to ask.. :green:

Cost is not so much of a concern, as long as it does not require expensive rare exotic parts.

PSU can affect the performance of the piece in so many ways.... Take a tube rectifier it can make the amp sound more liquid, enhance 3D imagery etc. better than any SS rectifier can....

Analag

Wow, that's a very interesting statement. Care to share some more with us?

 

[analag]

Here is one that I use, it works VERY well and is VERY reliable. Not one have failed so far. The output is 250V but you can make it adjustable if you like by putting a 100K pot between R5 R6 and reducing R5 R6 to a value of 100k each. Any questions?

Analag

 

[Learner]

[quote author="analag"]
Here is one that I use, it works VERY well and is VERY reliable. Not one have failed so far. The output is 250V but you can make it adjustable if you like by putting a 100K pot between R5 R6 and reducing R5 R6 to a value of 100k each. Any questions?

Analag[/quote]

COOL, thanks!! :thumb:

I might have some questions after building it, won't be able to do it any time soon as I am totally flat out with my finall year uController projrct at the moment ....

 

[tk@halmi]

[quote author="analag"]Here is one that I use, it works VERY well and is VERY reliable. Not one have failed so far. The output is 250V but you can make it adjustable if you like by putting a 100K pot between R5 R6 and reducing R5 R6 to a value of 100k each. Any questions?
Analag[/quote]


Thanks Rowan, this is good stuff. I am planning to build one too. Do Q1 and Q2 need heatsinks besides the mosfet?

Thanks,
Tamas

 

[analag]

Only the MOSFET need an heatsink Q1 and Q2 are cold to the touch. C2 should be at least 160V, C1 C3 are polyprops with the usual 630V rating.
All resistors are 0.25W metal film. (I play around with carbon film too)

Rowan

 

[DerEber]

Hi folks,

I sometimes use an old "Grundig" Tube Real to Real recorder as a mic-pre. It´s 2 Chanels and I added fitting transformers by try and error. It was a very cheep invention.... the recorder was about 20 euro for me.
It´s not a "use for everything" machine, but it realy can kick ass.

..... hm yes I had to disconect the drive to reduce the noise.

thats it