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Balanced Differential Linestage with Low Mu - perhaps DHT ?
Balanced Differential Linestage with Low Mu - perhaps DHT ?
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Old 7th November 2017, 05:02 PM   #11
artosalo is offline artosalo  Finland
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Quote:
Originally Posted by RhythMick View Post
Note the requirements for BALANCED, input and output
Here you go. Amplification is only some 1.7 times. THD at 5 Vpp is negligible (~0.007%).
The 50 mA CCS can be constructed in many different ways. In simplest mode it can be a LM317 voltage regulator with two resistors.
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Old 7th November 2017, 05:34 PM   #12
analog_sa is offline analog_sa  Europe
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Balanced Differential Linestage with Low Mu - perhaps DHT ?
Quote:
Originally Posted by RhythMick View Post
I've never used a CCS before.
Using a SS CCS there is no avoiding a degree of SS flavour.
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Old 7th November 2017, 05:37 PM   #13
audiowize is offline audiowize  United States
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Quote:
Originally Posted by analog_sa View Post
Using a SS CCS there is no avoiding a degree of SS flavour.
Have you actually compared a tube CCS to a solid state CCS?
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Old 7th November 2017, 05:39 PM   #14
artosalo is offline artosalo  Finland
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Here the pre with LM317 CCS.
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Old 7th November 2017, 10:38 PM   #15
analog_sa is offline analog_sa  Europe
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Balanced Differential Linestage with Low Mu - perhaps DHT ?
Quote:
Originally Posted by audiowize View Post
Have you actually compared a tube CCS to a solid state CCS?
No. Have only compared CCS plate loads to decent plate chokes. Despite the obvious attraction of low weight, low cost and high hum resistance, chokes tend to win every time. Obviously imhSo.
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Old 8th November 2017, 10:36 AM   #16
Blitz is offline Blitz  Germany
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I have just build one with OPT LL1692a and 4p1l...you use the opt in a step-down setup, so you trade tube gain for a low impedance.

Kevin has a lot of very good sounding CCS and very reasonable priced....plus he gives always great support on your projects.

http://www.kandkaudio.com/images/Inp...20PP%20Amp.pdf


On the discussion chokes vs. ccs:

I will test this in the very near future myself. It is quiet easy to do when we talk about anode choke vs. ccs. But I believe it is nearly impossible to exchange the CCS with a choke in the tail as most chokes have not inductance or to high resistance (talking about true Diff pairs).

Only exception I found was the work of Thomas Mayer: VinylSavor: The Ultimate Line Preamplifier

VinylSavor: 10Y Differential Line Preamp, Part 2

Looking at the poctures, Thoms seems to have used four Anode Chokes, one per tube, but at the cathode.


Indeed the idea of hybrid CCS would be intersting where you have a tube (or maybe choke ?) sitting on top of a transistor-CCS. I found this idea with an 6LW6 intersting: CCS Circuits | Tubelab

Last edited by Blitz; 8th November 2017 at 11:06 AM.
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Old 8th November 2017, 11:14 AM   #17
Blitz is offline Blitz  Germany
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...cant change the text anymore: I am actually not sure how he uses the four anode chokes of the first article as there are just many in this amp (looking into the second article)...the four chokes at the filament maybe/most likely will be only filament choke as Thomas likes LCL filament supplies...
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Old 8th November 2017, 12:02 PM   #18
zigzagflux is offline zigzagflux  United States
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That's what is unfortunate about vinylsavor's website. Pictures with zero detail, not even a description of the circuit. As if tube amp design is proprietary or subject to patent.
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Old 8th November 2017, 12:18 PM   #19
Blitz is offline Blitz  Germany
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Well...in the older days there have been schematics and even white papers and I believe this is tremendous...I would regard the way Thomas is sharing today more like as a teasing...for potential customers on his build quality and for us diy-guys to use our brains and figure the stuff out by using a forum like this.

Typically his circuits are very, very simplistic ...for very good reasons. So, it should not be too hard to fogure it out...
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Old 8th November 2017, 12:53 PM   #20
pieter t is offline pieter t  Netherlands
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Quote:
Originally Posted by zigzagflux View Post
That's what is unfortunate about vinylsavor's website. Pictures with zero detail, not even a description of the circuit. As if tube amp design is proprietary or subject to patent.
If you would have done some searching you would have found enough about Thomas' basic circuits and preferences.
Since he has gone "commercial" he does not feel the need, quite understandably, to publish all the details.
On the other hand he has been, and still is, on this forum on a regular basis, providing his advice "for free".
Not long ago I stumbled upon a DIY site of someone in your country who charges just for advice, what about that?
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