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Problem using Hammond 126C IST
Problem using Hammond 126C IST
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Old 31st March 2020, 02:23 PM   #141
euro21 is offline euro21  Hungary
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Problem using Hammond 126C IST
5C3S "near" equivalent is 5U4G (not A or B).
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Old 31st March 2020, 04:12 PM   #142
goddlediddles is offline goddlediddles  Ireland
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Problem using Hammond 126C IST
Quote:
Originally Posted by euro21 View Post
5C3S "near" equivalent is 5U4G (not A or B).
Thanks for that. It's great information. It looks like the one to go for is the 5AU4. It has has the same pin-out, but the filament current is 4.5 Amps. I think I have enough grunt in the power transformer to supply an extra 1.5 Amps. The 5V winding has a DCR of only .062Ω, so there should not be any great voltage drop with 4.5A. They are readily available on the web for about $20. No harm in getting one to try it out.
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Old 31st March 2020, 06:02 PM   #143
euro21 is offline euro21  Hungary
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Problem using Hammond 126C IST
I retired this tube (5C4S) long ago.

Instead of it I use 5U4GB (NOS black plate Tung-Sol) in my 300B SE.
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Old 2nd April 2020, 05:54 PM   #144
euro21 is offline euro21  Hungary
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Problem using Hammond 126C IST
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Originally Posted by euro21 View Post
I'm not sure, that this is the most decent driver for 300B.

Single stage 6SN7 has no enough gain -even with CCS load-, thus at higher input level this stage is the limiting factor.
Here is the asc file:
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Old 2nd April 2020, 06:09 PM   #145
goddlediddles is offline goddlediddles  Ireland
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Problem using Hammond 126C IST
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Originally Posted by euro21 View Post
Here is the asc file:
Great, many thanks again.
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Old 3rd April 2020, 01:56 PM   #146
goddlediddles is offline goddlediddles  Ireland
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Problem using Hammond 126C IST
Quote:
Originally Posted by 6A3sUMMER View Post
At 130 posts, we are in danger of a moving target (which can never be hit). We could go on forever, but lets settle on a design.
Yes, but I'm learning new stuff all the time. In the end we might end up with the best simple 300B SET design of all time. I'm grateful to you for introducing me to the IXCP10M90S, and to euro21 for getting me hooked on LTSpice. I'm learning it very slowly because it's a steep learning curve. Administrator Mooly has done a fine tutorial as a sticky, and is very good at answering all my silly questions. BTW, euro21's simulation of the paralleled 6SN7s is just what I needed. 1.2% distortion at 70 Volts peak drive is very impressive. Soon I will be able to do my own simulations on LTSpice if I can locate some models for the 6SN7.
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Old 5th April 2020, 08:41 AM   #147
goddlediddles is offline goddlediddles  Ireland
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Problem using Hammond 126C IST
Quote:
Originally Posted by euro21 View Post
Here is the asc file:
And one more request: could you share the 6SN7 model that you used? Many thanks again.
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Old 5th April 2020, 01:57 PM   #148
euro21 is offline euro21  Hungary
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Problem using Hammond 126C IST
Quote:
Originally Posted by goddlediddles View Post
could you share the 6SN7 model that you used?
Download Stephie (formerly Steve) Bench tube libraries:

:: View Forum - Circuits
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Old 5th April 2020, 01:59 PM   #149
goddlediddles is offline goddlediddles  Ireland
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Problem using Hammond 126C IST
Quote:
Originally Posted by euro21 View Post
Download Stephie (formerly Steve) Bench tube libraries:

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I'll do that now, thanks.
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