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Post subject: Deluxe 5A3 tweed DIY
Posted: Wed Dec 08, 2010 1:57 am
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Arjay, you prolly wish you did't turn me onto "how to post photos." 8)

DIY 5A3 Deluxe made last summer. Friend did the woodwork. I just did the chassis.

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Posted: Wed Dec 08, 2010 3:24 am
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Very nice job. How do you like the sound ?


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Posted: Wed Dec 08, 2010 3:43 am
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Initially it sounded much stouter than any real tweed. But, after a month or so, it mellowed. I used all mil spec tubes. Even used mil spec RCA 6072 instead of 12AY7. But, that amp still has the same tubes. Friend that made cab owns the amp. He loves the amp (at least he's always using it when I'm over at his house).

BTW... those Brimar CV511/6V6GT are TOUGH TUBES. I had a bunch of them, at the time. Even tried some in 6L6GC amps (re-biased, but same 425 VDC on the plates) and they sounded fine.

Not as good as gray glass RCA or Visseaux. But, pretty good.


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Posted: Wed Dec 08, 2010 4:12 am
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What did you use as a kit?

Nice layout of wiring and parts.

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Posted: Wed Dec 08, 2010 1:13 pm
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At the time, I believe the chassis was bought, bare, from Torres (friend bough it). I had all the resistors and caps. The trannies are Hammond items. Knobs, handles, etc from AES. Weber speaker. I had tubes.

Wood was done from scratch. Friend's Dad owns a hardwood specialty place (tey make spiral staircases, etc). Solid pine cab FWIW.


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Posted: Wed Dec 08, 2010 1:20 pm
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Check out this nice site re: DIY tweed Deluxes:

http://www.recproaudio.com/diy_pro_audi ... deluxe.htm


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Posted: Wed Dec 08, 2010 7:22 pm
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Yeah, very nice-clean work, Beemer ! I really like your choice of tubes and your pal's woodworking skill. That OD cap at the top left is to mitigate the standby switching pop, right ? How well does that set-up work ? Art

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Posted: Wed Dec 08, 2010 7:53 pm
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Art, I was told by a tech many moons ago, to add that cap to not only stop pops, but keep the switch from arcing. It's hard to find true 400 VC rated switches these days. Seems many go into pre-mature failure because of the HV they see. That's when all the noise starts.

Older Fenders with OEM switches are no issue. Most are rated 600VDC+.

Good blurb on SB swiches:

http://www.freewebs.com/valvewizard1/standby.html


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Posted: Wed Dec 08, 2010 8:08 pm
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Yeah, for sure ! I'm a big Merlin fan. His new book is the only thing on my Christmas list. Art

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Posted: Mon Dec 13, 2010 2:30 am
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Nice build, and thanks for the info on the switches, that may come in handy someday.


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Posted: Mon Dec 13, 2010 5:19 am
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The cap on standby switch shoud be in parallele with contacts isn't ? Not from one contact to ground as I see.

On one of his book, Kevin O'Connor write to put 10 to 100 nano farad, 1 Kvolts ceramic capacitor in parallele with the Standby Switch

The Ultimate Tone Vol 2, page 2-56


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Posted: Mon Dec 13, 2010 5:30 am
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Posted: Mon Dec 13, 2010 9:31 am
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Very cool! Really nice work on the cabinet. I think I have to skills to do the wood working but building the inards looks intimidating. Nice job!


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Posted: Mon Dec 13, 2010 7:18 pm
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Stratele52, you are correct. I called the guy who has that amp and that switch is reverse polarity switch and not a standby. This switch was kinda in fad at the time. Reversing hot and neutral to help reduce hum. Doesn't really work all that well.

Anyways, the switch is on the primary side of the PT. The cap is HV non-polar, to help keep switch from seeing DC (which we know is the real killer of switches). Kinda similar to this Hiwatt example (link).

I haven't done this reverse polarity mod in many amps (mostly hi-fi). And haven't done it in ANY guitar amps, since this Deluxe DIY.

Thanks, for clarification!

http://www.prowessamplifiers.com/schema ... SA412.html


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Posted: Mon Dec 13, 2010 8:01 pm
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That hook-up kind of suprised me, for a standby switch. That's why I asked how it worked out. But a polarity switch would explain it. My opinion of the benefits derived from conventional standby functions has changed quite a bit over the past year. I'll probably go with a trickle type of warm-up in my amps. The rectifier tube, choke, power caps are worth the effort IMO. Art

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