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unabashed plug - grid chokes

24.18.112.23
Posted on November 1, 2009 at 11:18:43
Doc B.
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Posts: 5755
Location: Pacific Northwest
Joined: October 6, 1999
Contributor
  Since: July 1, 1999
 I happened across a pair of BCP-16 GC NI grid chokes this week, in an old prototype chassis. Installed them in place of the 45 tubes' 270K ohm grid resistors in my shunt regulated 45 tweeter amps (with MQ output transformers and plate chokes) and was reminded of what a difference they make. I've been wrestling with some imaging issues on my system and along with beefing up the dynamic control like we know these puppies can do, the image got much better focus - quite an obvious transformation. Shawn was saying "D**n! Why didn't we do this before that demo we did a couple weeks ago?"

The only downside of this is that I have 16 more amps in the system that I'm sure will improve with the addition of BCP-16s. Time to start socking away some choke money...

Coupling cap, or DC?, posted on November 3, 2009 at 11:11:59
beeah
Audiophile

Posts: 247
Joined: June 10, 2004
 Doc - Is there a coupling cap between the driver and the 45, and if so, did you increase the value after installing the GC?
RE: Coupling cap, or DC?, posted on November 3, 2009 at 21:36:54
Doc B.
Manufacturer

Posts: 5755
Location: Pacific Northwest
Joined: October 6, 1999
Contributor
  Since: July 1, 1999
 Yes, it is cap coupled, not direct coupled. Direct coupling would preclude the use of a choke tying the grid of the output tube to ground. Actually I lowered the coupling cap value from .1uF to a .056uF, something I had on hand that I thought would sound better than the stock cap. It's a tweeter amp, after all - the tweeter is crossed over at 2200Hz.

Of course - thanks for the response. (nt), posted on November 4, 2009 at 06:00:59
beeah
Audiophile

Posts: 247
Joined: June 10, 2004
 nt

Grid resistors are an OK blend - Grid Chokes are pure Single Malt! (nt.), posted on November 3, 2009 at 02:32:32
Anthony Dockrill
Audiophile

Posts: 349
Joined: September 25, 2001

Doc... thanks, thanks, thanks for the kind words... (read more), posted on November 2, 2009 at 13:19:28
mqracing
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Posts: 3314
Joined: June 29, 2000
Contributor
  Since: May 7, 2004
 I didn't get the bill yet {smiles}.

If you need sixteen of these puppies... what I would give a try is the M6 versions... yea... they have less inductance than the nickel critters... but none-the-less even the M6 has a lot of L in them. Just a thought... if you'd like to try out a pair let me know. Or try a pair of nickel pinstripes.

We also have a second gen nickel version coming out... built on a slightly smaller core... with a pinch less turns... but still beats by a mile our advertised L's. And the beauty is we cut the capacitance (which was near zilch to begin with) to vanishingly ultra low levels of C. Will make them even easier to drive. And make them easier to install space wise... it's basically a win-win. Pricing will remain the same.

cheers to the Bottlehead crew,

have all you inmates been over to Dan's new forum yet? Go visit. Sign in.
and help Dan's new forum home become as great as his stay was on audio asylum.

Mike





Builder of MagneQuest™ & Peerless™ transformers since 1989

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