MagneQuest/Peerless Forum

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Original Message

RE: Grid Chokes

Posted by mqracing on August 18, 2016 at 20:58:50:
Here is a grid presentation of the various models\options of the BCP-16 GC (grid choke).

Original size (let's call it Senior) is available in two different coil configurtions. The standard and the Plus. The plus coil is our special winding configuration which is a symmetrical twin coil (mirror imaged) noise canceling (humbucking) design. The Senior is available in M3, M4, low nickel and high nickel.

The senior yields >1000H on the M series lams, >2000H on the low nickel and >3000H on high nickel.

Approx winding resistance of the senior grid choke is 3800 ohms.

The senior should be ordered when your swinging tens of signal volts. And for higher levels you'd want to stay away from the high nickel. I can advise upon your inquiry.

Also don't discount the M3.and M4. options. Even at the published spec (1000H) the impedance is 63.8K at 20 hz. At 30 hz the inductive reactance is 94.2K. As you double the frequency the inductive reactance. also doubles.
For example it would be 188.5K at 60 hz and a whopping 314K ohms of impedance.

The technical advantage of the M series is that they have much higher max flux density capacity and we are operating them significantly below that maximum value. Hence they will have very, very low distortion.

remember that nickel should (if you value clean reproduction) be operated at far, far lower flux densities. As an approximation low nickel should be operated at half of the available flux capacity of the M. series lams and high nickel at only approx a quarter of the value of the M. series.

We also have available a junior sized BCP-16 GC. It has a reduced core area (smaller lamination size and stack). It is intended for low signal level applications like in a preamp as just one example.

The junior is also available in the standard coil design as well as the plus series upgrade as discussed above. The junior is available in both high and low nickel. Generally you will want one of these two depending on drive level.

Interestingly since L is a function (in part) of the magnetic path length the smaller and more efficient magnetic circuit of the junior yields results that will meet the min inductance figures published for the senior grid choke.

The DCR is approximately 2400 ohms.

All of our grid chokes are supplied in channel frames. On the senior you can choose between brass or steel channels. The junior is only available with steel channels. All of our grid chokes come with solder lugs (terminals) so that you can use whatever hookup wire you prefer.

Hope this is helpful.

MSL