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RE: BCM11?

174.64.173.41

In Reply to: RE: BCM11? posted by Gordon Rankin on February 19, 2021 at 11:43:05

I have never actually tried a plate loading choke... in guitar amps, do you mean replace all of the plate resistors with them, or just use it on the first stage? If you were going that route, would you then do parafeed SE, or are you just doing this in the preamp? I am curious to know if that kind of cost justifies the difference (as I have never done it).

Also, if they are rated at 100mA, would you not use a much smaller one for 12AX7 or 6072a?

Follow Ups:

RE: BCM11? - mwiebe 06:41:21 02/24/21 (0)
As you point out using the BCM11 with its 100mA current design is not ideal for a plate choke for a 12AX7.

The BCP16AG was designed, as Gordon noted, to be used as a plate choke for a 12AX7, 6072. I think Mike designed this off the Freed PGC-16 which is rated 400H/1mA. I expect the Magnaquest choke to have higher inductance as Mike probably stacked the lams differently than Freed did. These Freed parts were probably used in preamps and mixing consoles with 12AX7 tubes.

Yes the BCP16AG can replace your plate resistor but it is not a straight swap as the DC resistance of the BCP16AG is probably different than the plate resistor you wish to replace. So you will have to accommodate that difference in DC resistance to experiment.

Used as the plate load of the first stage could lower power supply noise passed on to following stages as a choke offers more power supply isolation compared to a resistor generally, though chokes can pick up their own electromagnetic "noise." It could also offer a little more drive to following stages that can be SE or PP. Whether the effort is worth the cost is a personal matter.
Matt
RE: BCM11? - awsjr 06:26:13 02/24/21 (0)
bcm -11
Here are some of the specs...
12 henries
100 madc
nominal DCR of 145

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