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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: Audio Research D70 Mark1 posted by Stewen on May 20, 2014 at 11:36:05:
Stewen,The Audio Research D70 and SP8 with Acoustat 2+2's was the system at a Los Angeles shop that inspired me into the world of tube gear- in 1985. I initially used the D70's cousin, a D115 MKII with an SP8, and later changed to the SP10, but kept the D115. and I also have the SP8 still with it's original tubes. In some ways, the D70 is a bit smoother and more delicate than the D115, and I though over the years of having one as at for a second system as they were not extremely expensive used. Instead, as this was my office system I chose ARC solid state- an LS3 and D130.
I've been lucky that the entire time, I've used GE 6550A's with a couple sets of Philips ECG thrown in- but neither of these are around in sufficient quantities anymore. Our friend Jim McShane was the last seller that had a lot of the GE. In a couple of years, I'll be in the same boat trying to work out the best modern tube for it, and the Tung Sol 6550's would be high on my list.
My memory though of the D115- and by family association the D70 is that ARC and the magic Leonard in service made loud noises about avoiding KT88's. I forget the reason, but I think they were supposed to be hard sounding and/or not very dynamic. They may have upset the power supply in some way- I don't remember the details if was aesthetic, technical or both. Sorry to be vague, but the KT88 was definitely strongly discouraged in any of the ARC 6550 designs.
As to the big blue electrolytic caps, they do like to eventual retire from capaciting and if they've never been changed, it's a good opportunity to do it. My memory is that the D70 and D115 used the same one- only a different number of them. They are extremely expensive from ARC, but the identical model Mallory was available from Mouser >
Electrolytic capacitors for D115 (5)- Mouser Pt/ CGS801T450V4
http://www.mouser.com/ProductDetail/Cornell-Dubilier/CGS801T450V4L/?qs=%2fha2pyFadui8mf0wOL%2foW35eR2P5ZZ6FrYxIS99c09pIjGbQxGUoig%3d%3d
If these are not the correct values, I suspect Mouser will have the right ones.
The painting is called "Theatre for the Death of a GE 6550A".
Cheers.
BambiBoom
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Follow Ups
- RE: Audio Research D70 Mark1 - Bambi B 05/21/1416:40:54 05/21/14 (0)
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