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Post by jelosno on Aug 12, 2006 20:31:37 GMT
That's my plan. I want to complete the kit and use it as supplied by MAD. Once this is done I will start working on a new case. When the new enclosure is finished I will transfer the internals over. After that stage the upgrades will be introduced and tried. Might take a while to get the parts available anyway. I know how to deal with stainless steel and aluminium. Used to build expedition mobiles which used lots of that stuff. Also custom parts for dual use bikes. I do have some special tools for stainless steel but the big things like precission cutting and large openings and smoothing the edges I will leave to a specialtz shop for sure. Here in Cape Town is a lot of ship building and repairs going on. Usually there's always a oil rig fixed to the harbor for overhaul. There are some workshops to choose from @ mrarroyo I have seen some of your posts at that 'other place'. Guessed that much What's the story behind your avatars? I was a beelte (Kaefer in German) fan from days before I had my license. Used to run a workshop for them in the late hours with a friend. Tunes some very nice ones. Had to get rid of most of them before I moved down here. Still have a convertible in Austria in the Garage though.... waiting there.... Stefan
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rickcr42
Fully Modded
Rest in peace my good friend.
Posts: 4,514
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Post by rickcr42 on Aug 13, 2006 16:22:35 GMT
J-Man : Rickamundo : came across this page which seems to have a fairly good selection of both new and NOS parts and being in your native tongue (yes ?) should be a lot easier to deal with the informational content and shipping should be easier on you..... www.fragjanzuerst.de/eindex.htm
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Post by jelosno on Aug 14, 2006 9:56:14 GMT
Nothing to worry! It is a '76 1303 (Superbeetle). Original rack and pinion steering, McPherson front and the same original VW rear axle that was LATER adapted by Porsche for their 944s. The VW is stripped and has the - without much modifications - fitting 944 4-disk brake system waiting. It used to have a early 911 dogleg 5 speed gearbox and a 2.2 litre 175 PS typ 4 engine..... She's sleeping now.... Bummer! Found a substitute to drive around with the steering on the wrong side: Mini Cooper Convertible. Pretty much the same feeling but less punch and smaller
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Post by jelosno on Aug 14, 2006 10:08:28 GMT
Lloyd Peppard suggested there Black Gates as well...
Would you stick to the 'values' that are in the schematics or would you go higher here as well? Is it always better to go for a mucho capacity when replacing caps or better to stick to the capacity value of the original design?
On the 'other forum' there was also mentioned to put a resistor in the line out path to match the 32 Ohms of the Grados better. Not sure of sonic impacts - it is said to reduce humm that 'could' be there - but that should allow more use of the volume knob for finer adjustment.
From the latest email of Lloyd Peppard: I can include 33 Ohm resistors at no extra cost (they are 1 W carbon film). Is that a good part, should I leave it out or replace it with something else?
Stefan
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Post by jelosno on Aug 14, 2006 10:19:32 GMT
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rickcr42
Fully Modded
Rest in peace my good friend.
Posts: 4,514
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Post by rickcr42 on Aug 14, 2006 15:19:55 GMT
anything is better than tants which have only one strong suit in my opnion-small size so good for portables and no more. Other than that I am not a real big fan of BG caps except for the non polarised versions when big output couplers are needed or for cathode bypass caps.Never in the power supply.they not only take forever to break in but once you do you better not go on vacation or leave the amp idle for weeks or you are back to square 1 and have to go through the rocess all over again-gritty is the word i would use
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rickcr42
Fully Modded
Rest in peace my good friend.
Posts: 4,514
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Post by rickcr42 on Aug 14, 2006 15:33:27 GMT
A myth.The tube guys been reading too much solid state amp ad copy and are misunderstanding intent here.The power supply section after the rectifier is a FILTER so change one thing and you better be prepared to change everything.That means section re-design Series resistor ? If yes then a Dynamics Killer.If you have any residual hum check your layout and address your heater wiring.If that don't get 'er done toss a choke in the position where the resistor resides in the power supply between the two filter caps.too much sensitivity reove the cathode cap and/or add resistance to pad down the input NOT the output If this is a parallel resistor then try the part on the "nothing to lose" theory.Build the amp without then "clip in" the resistor for A/B comparisons
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rickcr42
Fully Modded
Rest in peace my good friend.
Posts: 4,514
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Post by rickcr42 on Aug 14, 2006 16:28:15 GMT
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Post by jelosno on Aug 15, 2006 16:24:00 GMT
THANKS A LOT! That was some very useful input. These two links explained quite something to me. Being a non electronix guy this was news. Easy to follow though. I have settled for a EAR+ HD which includes the HEXFREDS and BG caps as cathode bypass caps for the first stage and coupling cap to the output transformers. This are the standard HD option caps. I have also opted for four 'Russion' PIO caps for any experiments later on. They go for $10 each. Not taken the option of the three Black Gates for the power supply. Still thinking of getting - also for a later stage - three 100uF Solen Fast Caps for a to be build new chassis. They would be $ 100 (for three). Will sort out my non working old PayPal account and then go ahead. Stefan
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rickcr42
Fully Modded
Rest in peace my good friend.
Posts: 4,514
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Post by rickcr42 on Aug 15, 2006 19:53:06 GMT
and HUGEtoo
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rickcr42
Fully Modded
Rest in peace my good friend.
Posts: 4,514
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Post by rickcr42 on Aug 19, 2006 22:56:00 GMT
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Post by dsavitsk on Oct 1, 2006 8:07:25 GMT
the Ultrapath is what is also known as a "parafeed" or "Western Electric" circuit and not only IS but must be a transformer coupled circuit. Hey Rick, the Ultrapath is not parafeed and is different from the WE circuit. www.nutshellhifi.com/library/ETF.html
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rickcr42
Fully Modded
Rest in peace my good friend.
Posts: 4,514
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Post by rickcr42 on Oct 2, 2006 3:54:06 GMT
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Post by dsavitsk on Oct 2, 2006 17:34:10 GMT
call it what you want but looking at the cathode cap coupling to the output transformer I say they are more alike than not : Variations on a theme perhaps, but the Ultrapath has DC across the transformer, and is a single feed. The Parafeed has no DC and is a parallel feed. If you tried to build an ultrapath amp with a parafeed transformer, it would not work, at least not for long.
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rickcr42
Fully Modded
Rest in peace my good friend.
Posts: 4,514
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Post by rickcr42 on Oct 3, 2006 4:57:32 GMT
It is STILL a variant in general terminology due to the cap being cathode connected and not strictly in the signal path according to traditional transformer coupled stages even though cap sonic quality is essential even in this type of connection.
Yes we can discuss semantics and the finer points of when an amp is considered DRD/WE/Ultrapath (or whatever twist/naming a particular manufacturer wishes to come out with) but the similiarities are greater than the differences so correct on the wide stage though different in the details on how to get from the final stage to the transformer
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Post by audioray on Jan 29, 2013 22:53:00 GMT
need info on chinese amp. HP 100a
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Deleted
Deleted Member
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Post by Deleted on Jan 30, 2013 0:22:34 GMT
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Post by PinkFloyd on Jan 30, 2013 13:24:48 GMT
Blimey, this is an old thread
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