Clementine 4 me 2

sweet & juicy SE amp for 1626 Darlings and the 6L6 family

Clementine 4 me 2

Postby Eckhorn » Tue Feb 12, 2013 10:36 am

Hello,

I am new to this forum :-) I have built a tube amp based on EL84 and I want to build my next tube amp. I have a pair of 6L6GC and some 6SL7GT so after surfing in the www I found you :-) The clementine amp seems to be my next amp. Since my transformer does not have that high voltage I wanted to play a bit around with Tube CAD. Now it seems that this program is not available anymore. Are there alternatives for tube simulation? The program should not be too complicated I do not want to spend weeks to learn it.

Thank you for your help.

Kind regards,
Bernie
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Re: Clementine 4 me 2

Postby Shannon Parks » Tue Feb 12, 2013 11:32 am

Tube CAD is great! Grab a copy: http://www.tubesandmore.com/products/B-CD028
Note that it is not Win7 64-bit friendly. You would need to use Virtualbox to overcome that.

Shannon
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Re: Clementine 4 me 2

Postby Eckhorn » Tue Feb 12, 2013 12:06 pm

Thank you for your answer Shannon

No problem I can run it virtualized on a 32bit OS. Do you know if there is a download version available? I am from Europe and I don't know how easys it is to order from that store (I will check if there is no other option).

Do I need the SEamp CAD also?

Thank you.
Bernie
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Re: Clementine 4 me 2

Postby Shannon Parks » Tue Feb 12, 2013 1:13 pm

I think it was never a downloadable file. With 32-bit Win 7 you may be able to install without issues. Yes, SE Cad is also a great program. I would rate those two as the most useful of all John Broskie's software that I've used.

Shannon
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Re: Clementine 4 me 2

Postby Shannon Parks » Thu Feb 14, 2013 7:11 am

And here's one more piece of software for the DIYer which is invaluable, Duncan's PSU Designer II:
http://www.duncanamps.com/psud2/index.html
"PSU Designer II is designed to help you with the design of simple linear (unregulated) mains power supplies, as often found in tube amplifiers."

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Re: Clementine 4 me 2

Postby Eckhorn » Mon Feb 18, 2013 10:47 am

Hello Shannon,

Thank you again (y) I was using the PSU Desinger already some time ago and I will use it again. I start to buld my Clementine now (board and some of the parts ordered) and I will for sure have some questions. Can I go on with that Thread or should I start a new thread for each question (sorry I am the new guy here).

My first question is about C7/C8 of the schema. You are using 450 Volt Caps with 330VAC input...

If there is some interesst I will document the build with photos later on.

Thank you.
Bernie
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Re: Clementine 4 me 2

Postby Shannon Parks » Mon Feb 18, 2013 1:22 pm

The PA774 and the Edcor version (XPWR005-120) are probably a little closer to 320V-0-320V, but your concern is well warranted. The GE CL90 inrush current limiter is the key. When the amp starts up, there is no current draw on the B+ as the heaters start to do their work. The CL90 helps to keep the B+ under the 450V rating during those first ten seconds by acting like a 120 ohm resistor in series with the primary. I've monitored this closely and it works very well. Note also that modern electrolytics have surge ratings that are a little higher than steady state, but the CL90 gives us a saftey margin.

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