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nickel and pinstripe question

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johnsonad:

--- Quote from: 2wo on January 24, 2014, 11:32:15 AM ---
--- Quote from: Paul Joppa on January 24, 2014, 07:38:48 AM ---The alternative is to put all the nickel lams in a bunch in the center of the stack, sort of a single chalk stripe. I think Sowter has one done that way. No idea what the performance difference might be.

--- End quote ---

That is actually how the BH-5 pinstripes  are done...John

--- End quote ---

Looking under the hood John? ;)

Hank Murrow:
I remember that back in 2002 or so Mikey built two pairs of TFA 2004 Jr's with the Cobalt slices(10 or 12) centered in the coil and surrounded by M4; and he reported that they gave 80% of the inductance of an all Cobalt stack for a considerable reduction of the cost of the all-Cobalt TFA 2004 Jr.

I was fortunate to purchase the 10 slice pair and Paul Birkeland built them into a Custom BH 2A3 stereo amp for me with Paul Joppa's trick dual and shunt-regulated power supply with MQ chokes, etc. The amp still impresses me every time I listen, especially with the JJ 2A3-40 output tubes. There are all-Cobalt B7's in the matching Linestage as well. Hope this contributes to the core material considerations here.

Cheers, Hank in Eugene

Hank Murrow:
Another way of looking at the pinstripe question is that M4 provides a grunt factor, while Cobalt is agile; sort of combining the best of a 18-wheeler with a very light criterium-bicycle.

80% of the inductance of an all-Cobalt tranny for 120% of the cost of M4 alone. I think I have that right, but I will rely on Mike to correct the metaphor(and the figures) if needed. I love his thinking____ and the resulting sound. I have bass flat down to 30 Hz in my room with -4Db down at 24 Hz. That is driving my Blumentein Orca/BUF Sub speakers. I am sure the amp is flat way lower.

Cheers, Hank in Eugene

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