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Old 10th July 2013, 09:30 PM   #11
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Originally Posted by Eli Duttman View Post
Correct operation of a tube, with few exceptions, requires the control grid be negative with respect to the cathode.
Thanks for that. The light suddenly came on and it nearly blinded me. I should read on tubes some more.
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Old 11th July 2013, 11:38 AM   #12
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I have run a simulation of the circuit with MOSFETs in place of the tubes. It works, but the output is only 5Vpp, so some more work is needed. Since the OP has reacted yet, I will leave it on the back burner.
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Old 11th July 2013, 03:36 PM   #13
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My 2, Pointlessly equal impedance hybrid concertina with Mu/2 gains...
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Old 11th July 2013, 04:14 PM   #14
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Good morning,
I'd like to try the above circuit. Any guesses on how much swing? I'm building a sweep tube amp that will probably have 40-45v of bias.

Thanks,
Ray
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Old 11th July 2013, 05:01 PM   #15
M Gregg is offline M Gregg  United Kingdom
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Thanks for the input so far,

Great ideas and circuits.

I was wondering how easy/hard it would be to implement, (reduce space) with some of the more complex splitters. Nice to see other examples.
Theoretically I guess you could build a whole tube circuit with FETS I wonder if anyone ever has and what it sounded like (Off topic) FET with OP Tx.
Back to phase splitters the small 6V6 is interesting.

Regards
M. Gregg
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Old 11th July 2013, 05:46 PM   #16
mos57 is offline mos57  Italy
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Those days i have presented a new type of phase splitter. There are also version specified for tube circuits.

Have a look at this thread:

The Fully Differential Phase Inverter

Francesco
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Old 12th July 2013, 09:55 AM   #17
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by ingenieus View Post
I can read Dutch and Flemish, but my French is non-existent.
try with google translator

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Here are the actual links.
wow, a wimpy BS107

btw, would a simple SS 'phase splitter' handle multiple parallel output tubes better than if a tube
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Old 12th July 2013, 01:41 PM   #18
M Gregg is offline M Gregg  United Kingdom
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Originally Posted by tinitus View Post
wow, a wimpy BS107

btw, would a simple SS 'phase splitter' handle multiple parallel output tubes better than if a tube
The Velleman K4000 comes to mind with a 12AX7 in concertina driving 4 EL34 per channel. You may have a point!

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Old 12th July 2013, 02:58 PM   #19
tinitus is offline tinitus  Europe
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not so sure
driving capacitance also seems problematic with solid state designs
maybe its all the same, a Murphy's Law

anyway, what is the reasoning for using solid state devices ?

gosh ! I only know the difference of tubes and SS by the looks
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Old 12th July 2013, 03:01 PM   #20
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