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Old 23rd March 2008, 11:26 PM   #1951
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Join Date: Jul 2005
Location: Montréal QC
So, the Irish can build stuff!!

That's the amp that inspired me

L
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Old 24th March 2008, 01:54 AM   #1952
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" ... So, the Irish can build stuff!! ..."

Not only that, but the Irish are the handsomest, friendliest, most musical and most talented of all the planets folk ... modest too.
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Old 24th March 2008, 05:29 AM   #1953
Jeb-D. is offline Jeb-D.  United States
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The newest member to my family.

Click the image to open in full size.
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Old 24th March 2008, 11:15 AM   #1954
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That's pretty!!

And re the irish, yup! that's the majority. except from this bizarre nouveau riche culture - driving 2008 Range Rovers, but diesel ones, "so ye can claim de VAT back". Lol - all show no go

L
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Old 25th March 2008, 11:38 PM   #1955
Janez is offline Janez  Slovenia
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My RH84 SE (not finished, housing is empty, OPTs need painting)

http://img142.imageshack.us/my.php?i...newamp2ri4.jpg
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Old 27th March 2008, 12:59 AM   #1956
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Location: Eureka, CA
I *LIKE* this chassis repurposing! I'm going to need to stop by Halted (No. Cal. surplus place) and peruse the shelves for something wacky to build a tube amp into... Next project... or the one after...

Michael
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Old 27th March 2008, 05:56 PM   #1957
Janez is offline Janez  Slovenia
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New pictures:


http://img230.imageshack.us/my.php?i...mpfronttp2.jpg
http://img230.imageshack.us/my.php?image=ampbackdb3.jpg
http://img401.imageshack.us/my.php?i...pinsidehk7.jpg

It's almost finished now, next week I will replace some improvised resistors with new ones and close openings at back. PSU is separated but it's not finished yet.
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Old 27th March 2008, 07:21 PM   #1958
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" ... I *LIKE* this chassis repurposing! ..."

Ditto that!

(I'm working up a sub woofer amp built into a tequila display box. )
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Old 28th March 2008, 06:55 PM   #1959
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errrr,,, please excuse my ignorance but what's a tequila display box?
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Old 28th March 2008, 08:39 PM   #1960
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Join Date: Sep 2003
Location: Alps:Tube amp designs over 150W, SMPS guru.
The Red sports car is illusionary but there are transformers around far bigger than that car.
Red Sports car performance for an amplifier ? Yup..This is a big and demon heavy amplifer to construct. No-one should attempt this size project without a physiotherapy and heart clinic nearby. Heavy handed- and high power electronic approach essential. Also assured 100% solder joint reliability. Stress bearing parts of the chassis uses airframe solid rivets for strength. There's alot to this practically completed over-winter project. Using point to point tag assembly this 250W+250W leviathan shown with new issue Tung-Sols 6550 comes in at iron-healthy 55kg (121Lbs)
These new issue tubes are excellent performers and upgrade others in their class and with amp derrated down to 450V B+; well matched parallel p-p pairs will easy tip 110W at 0.05% thd at 1Khz. (85mA Iq each) With a RS232 programmed PFC 1kW power supply, economic variable B+ performance is easily attained. All other internal supplies are stabilised.
Driver line up, 12BY7’s as balanced voltage driver triodes and ECF80 p sect as triode p/s.. simple.
Using KT88’s and 575VB+ the design goal is achieved with outputs exceeding 250W per channel extracted. (Strangely I got 650W in bridge mode, this seems high)
Although this is the last of the monster amps I shall build, the approach to amplifiers of this power class is somewhat different to lower powers as a considerable amount of detail, protective circuitry and larger earthing is required. The 4mm thick barbeque grill earth bus is very succesful.
Designed for longevity and a fantastic spec.. ANYone else on a monster project ?

richj
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