Express Documents

Trainwreck schematics, designs, pictures. Only members may post files here.

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robtone
Posts: 10
Joined: Mon May 31, 2010 11:48 pm
Location: Austin, TX

Express Layout

Post by robtone » Wed Jun 16, 2010 2:55 am

Ron,

What program did you use to draw this layout? It looks better than any thing I have seen.

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Ron Worley
Posts: 902
Joined: Mon Dec 24, 2007 8:21 pm
Location: Keller, TX

Re: Express Documents

Post by Ron Worley » Fri Jun 25, 2010 6:13 pm

Microsoft Visio, it's really easy to use .....
Ron

TheGimp
Posts: 199
Joined: Fri Oct 08, 2010 5:19 pm

Output tubes in TrainWreck

Post by TheGimp » Fri Oct 08, 2010 8:01 pm

Greetings.

Great site and wonderful documentation on the TW Express.

One question please?

With regards to t he schematic, shouldn't V4 and V5 be "EL34 or 6L6" instead of "EL34 or 6V6"? The 6L6 is a closer match to the4 EL34, and the 6V6 is not rated for the plate voltage present.

Well, that was two questions but the first shouldn't count.

Cheers.

Sven

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FYL
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Re: Output tubes in TrainWreck

Post by FYL » Fri Oct 08, 2010 8:35 pm

With regards to t he schematic, shouldn't V4 and V5 be "EL34 or 6L6" instead of "EL34 or 6V6"? The 6L6 is a closer match to the4 EL34, and the 6V6 is not rated for the plate voltage present.
EL34s or 6V6GTs for the canonical amps. Good quality 6V6GTs work fine in an Express-style amp provided that they're properly biased. Check vintage data sheets : they were rated at 1 200V pulse for TV applications and work fine at up to 450 V in geetar amps.

They offer slightly less power - but the amp is still LOUD! - with a different sonic presentation, chimier and rounder (less in the mids) and somewhat softer.

TheGimp
Posts: 199
Joined: Fri Oct 08, 2010 5:19 pm

Re: Express Documents

Post by TheGimp » Fri Oct 08, 2010 8:51 pm

I was aware that they could be run in triode mode as deflection amps at 315V with up to 1200V peak output, but didn't realize they would hold up to near 400V in pentode mode, mush less 450V.

I had never seen that in a stereo amp.

Thanks.

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FYL
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Re: Express Documents

Post by FYL » Fri Oct 08, 2010 9:25 pm

Plate voltage alone doesn't kill a tube.

Most quality small or medium octals can work up to 500 V or so with the right glue, bias and screen supply, then arcing between internal elements, base isolation as well as socket quality become limiting factors.

Have a look at the original datasheets for the 6V6GT and derivatives: all curves are traced up to 500 V.

Jim Kelley ran a quad of Sylvania 6V6GTAs at 480 V in his great sounding amps, and, provided that bias was properly set, they ran hot and happy. So a tad above 400 V in an Express-like amp isn't a problem...
:D

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M Fowler
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Location: Moorhead MN

Re: Express Documents

Post by M Fowler » Fri Oct 08, 2010 10:01 pm

Sven,

Here is Ken's TW catalog and it talks about the Express. :)
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JDJ
Posts: 5
Joined: Tue Nov 30, 2010 12:48 am
Location: NC

Re: Express Documents

Post by JDJ » Thu Dec 02, 2010 12:56 am

Wow!! This is incredible! I think I may have found my next project! I am astounded by the time and effort put into this... :shock:

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Art Ippon Judo
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Joined: Thu Jan 28, 2010 2:06 am

Re: Express Documents

Post by Art Ippon Judo » Thu Jan 20, 2011 7:02 am

Thank you!

:)
Ippon!

surfsup
Posts: 1513
Joined: Mon Nov 29, 2010 12:21 am
Location: Chicagoland

Re: Express Documents

Post by surfsup » Mon Feb 07, 2011 12:20 pm

Ron, although I haven't gone through this yet, I just downloaded the files and wanted to thank you for your effort and let you know it is still helping people. One day I will build one of these and I'm sure your work will save me a lot of time and headaches, making the whole process a far more enjoyable experience. Thanks!

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Paul-in-KC
Posts: 107
Joined: Tue Jan 24, 2012 8:57 pm
Location: Kansas City (metro area)

Re: Unbelieveable

Post by Paul-in-KC » Wed Jan 25, 2012 5:29 pm

fayser wrote:Ron.. it has to be said... this is an incredible piece of work... it's real pick your jaw up of the floor stuff.... well done to you and all the gang on this forum.. this has made it so easy for home enthusiasts like myself to entertain building one of the most revered amps of all time ... my hat is firmly off to you .

Tony
+1+1+1+1 :D

Can't be said too much. super thanks to Ron for the countless hours of original effort and then the pains taking time spent revising these docs for the benefit of others.

AND of course, credit all of those here that helped Ron accumulate all the knowledge required to put this together.

Thanks!

zambo
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Location: cali usa

Re: Express Documents

Post by zambo » Sat Jul 07, 2012 5:12 am

Ron, Thank you. I look at these drawings at least once a week or more for the last year or so now. Your work is appreciated 8)

zambo
Posts: 89
Joined: Fri Sep 03, 2010 5:27 am
Location: cali usa

Re: Express Documents

Post by zambo » Sat Jul 07, 2012 5:13 am

Ron, Thank you. I look at these drawings at least once a week or more for the last year or so now. Your work is appreciated 8)

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Ron Worley
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Location: Keller, TX

Re: Express Documents

Post by Ron Worley » Tue Jul 10, 2012 11:32 pm

You're all very welcome. Yes, this document is a culmination of all that I learned from the masters here, as well as through the learning curve of doing my actual builds. I don't post much anymore here, life has a way of sucking up even more of my free time!
Ron

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M Fowler
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Location: Moorhead MN

Re: Express Documents

Post by M Fowler » Wed Sep 18, 2013 6:13 am

Trainwreck Express layout by Triode.
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