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Old 10th December 2012, 01:31 PM   #21
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@Shoog: What is the preferred manufacturer for the 5687?

Regs, Dirk
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Old 10th December 2012, 02:54 PM   #22
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I have no particular preference - I use what I could get.

Shoog
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Old 10th December 2012, 03:19 PM   #23
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Default so try these???

2 x JAN 5687 WB Raytheon Röhren / Tube - Neu/New Made in USA | eBay

Dirk
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Old 10th December 2012, 05:13 PM   #24
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Looks fine.

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Old 11th December 2012, 06:48 AM   #25
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Mine are "National" brand.

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Old 12th December 2012, 12:20 PM   #26
vtr is offline vtr  Switzerland
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Default no fets

i had some years ago the rtp with fet on top and bottom of the slcf-its way below the all tube version, and the fets can fail for example cahnging cables etc.






Quote:
Originally Posted by HVfanatic View Post
And to continue: You also have experience using fets for the slcf:

My idea is, using a cascoded bjt current source, and a mosfet for the upper part. Should I use 6h30 for the cathode follower (best current?)

I really don't understand, why a valve for the upper follower is a benefit...

Did you try with fet and valve in comparison??? Or did you try the fet for current source and upper follower, an then switch over to 6922 valve arrangement?

I highly appreciate your opinion, because I thing, you gained valuable experience...

Regs, Dirk
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Old 13th December 2012, 11:43 AM   #27
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Thanks for the info. So I will not try to substitute tubes with fets...
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Old 16th June 2013, 03:55 PM   #28
6L6 is offline 6L6  United States
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Does anybody know the gain of the linestage?

Also how many volts can it swing without clipping? (I'm interested in trying it as gain for Pass F4...)
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