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Old 27th December 2013, 08:09 PM   #1
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Default Red Pilot (240)

I "improved" the Pilot 240 i had a while back -- it's going to get improved again -- has just been sitting on the shelf for years. Telux multiple LED's in the EL84 cathode lines:

Click the image to open in full size.
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Old 28th December 2013, 12:08 AM   #2
kevinkr is offline kevinkr  United States
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How good is the balance in that somewhat funky driver stage?
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Old 28th December 2013, 01:02 AM   #3
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The only difference between this and the original is the replacement of the cathode bias resistor with the TELUX led matrix. I am going to guess that R1,2,7 could be replaced by a potentiometer for the purposes of setup.
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Old 28th December 2013, 01:29 PM   #4
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I have several Pilots but I have no experience with using LEDs for bias. I've been meaning to give them a try sometime.

Quote:
How good is the balance in that somewhat funky driver stage?
Pilot amps are highly praised for their sound. The 232 is widely considered one of the best PP 6BQ5 amps around. The Pilot integrateds such as the 240, 245, and 246, are built around the same basic 232 design. I've always found it odd, however, that paraphase inverters (as used in those designs) are generally frowned upon from a technical perspective. Same holds true for the Magnavox console amps, which have a loyal (some would say rabid) following.

My understanding of design and technical detail is, admittedly sorely lacking. And I've heard all the arguments against the paraphase - "not elegant", "not balanced", etc.

I like what I hear with these designs, though. =8^)

. . . Charlie
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Old 28th December 2013, 02:00 PM   #5
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I also have a Pilot receiver pulled out of the recycling bin in our town.

The 240 was given to me by the father of friend but it wouldn't make any noise whatsoever. (Slowly brought it up using a variac.) When I did power it up I discovered problems with the filter caps and some of the resistors were charred and way out of compliance.

5 of the Telux LEDs, should get the bias to the right level, but I'll bench test it first and relate the results.
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Old 28th December 2013, 05:29 PM   #6
Cassiel is offline Cassiel  Libya
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Quote:
Originally Posted by FlaCharlie View Post

I like what I hear with these designs, though.
I'm with you Charlie. PP with a paraphase splitter, best thing I have built. Luckily I ignored all the techies opinions on this subject.
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Old 28th December 2013, 05:34 PM   #7
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One of the most musical sounding driver stages. It was also used by L' Audiophile (Paris) in various amps.

Don't listen to opinions, listen to the amp
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Old 28th December 2013, 05:51 PM   #8
M Gregg is offline M Gregg  United Kingdom
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Anyone have a link to schematics for:

The Pilot integrated such as the 240, 245, and 246,

Just curious..

Regards
M. Gregg
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Old 28th December 2013, 06:20 PM   #9
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Quote:
Originally Posted by M Gregg View Post
Anyone have a link to schematics for:
The Pilot integrated such as the 240, 245, and 246,
http://www.tech-diy.com/TubeDesigns_...0/Pilot240.pdf
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Old 28th December 2013, 08:17 PM   #10
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You have the diodes connected in shunt (Vd= 1.83-2.67v)? is this rock and roll?

Art
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