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Old 30th October 2013, 04:38 AM   #591
wineds is offline wineds  Australia
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Thanks Uriah that is a good idea. Maybe I can build it into the Valab case. Looks like 4 FETS and an output coupling cap might be all I need to add if I can find +/- 9V in the Valab?
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Old 2nd November 2013, 01:26 AM   #592
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I was thinking of putting a b1 on mine but the last B1 I built I needed gain for the amp. I will try the passive pre-amp on my F6 but my suspition is I will need a little gain.

Bill
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Old 2nd November 2013, 11:17 AM   #593
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Bill, I will go and use the CALVIN - buffer. The CALVIN - buffer is an enhanced version of the JLH-buffer, and I like its schematic very much.

If you are in need of a PSU for it: I have just layouted a 115VAC/230VAC PSU for the CALVIN-buffer (see attached image).
Do you want some PCBs?

Best regards - Rudi_Ratlos
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Old 2nd November 2013, 11:50 AM   #594
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How calvin compared against dcb1 ?

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Old 2nd November 2013, 12:32 PM   #595
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Ivan, I will not be able to answer your question without any empathy.

Those, who are addicted to Nelson Pass' ClassA - amplifier designs, will prefer his B1 buffer.

I am not.
I have taken part in several "amplifier shootout - sessions", and my individual impression has been that ROENDER's FC-100 or a very well set-up SYMASYM show more liveliness,
details and stage than an AlephJ or F5 or .. does.

This is the only reason (missing sympathy for the B1) that I will go for the Calvin buffer (despite the fact that I have built a "quick-and-dirty" version of the original JLH-buffer
on a VERO-board - and it sounded very well in my ears).

I have not yet built the CALVIN-Buffer, since I am waiting for the (perfectly matched) input transistors, heatsinks, ...

Best regards - Rudi_Ratlos
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Old 2nd November 2013, 12:39 PM   #596
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Thx Rudi. I might need buffer too. I have b1 build but I need no capacitors in signal path. Does calvin colour the sound or is it more like dcb1 ?

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Old 2nd November 2013, 03:57 PM   #597
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Rudi,
I actualy bought an extra pair of Hensner's calvin buffers for that reason, funny I was looking around for a power supply this morning small enough to fit in the case with the VC pre. I will take you up on this one, but promise not to pester you about the parts.

Bill
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Old 16th November 2013, 01:23 AM   #598
wineds is offline wineds  Australia
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Setup my old Logitech 1000i for VCPre
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Old 23rd November 2013, 07:16 PM   #599
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Hi there!

After long waiting I finally got all the electonic parts from reichelt. I read the emails and the instructions from rudi and there was mentioned a pair of the LDRs should be marked as "Series LDRs" and the other pair as " " .

But in the package of the mathced LDRs I do not have any pair marked as "Series LDRs" so I dont know which one to use as series and which one to use as shunt.

I attached 2 pics with the values measured. Could someone help me regarding this!? Don't want to do something wrong!!

Thank you in advance!

Greetings from germany
Ron
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Old 23rd November 2013, 09:04 PM   #600
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Take the top - LDR-pair as shunts and the bottom - LDR-pair as serials.


Best regards - Rudi
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