MagneQuest/Peerless Forum

Welcome! Need support, you got it. Or share your ideas and experiences.

Use this form to submit comments directly to the Asylum moderators for this forum. We're particularly interested in truly outstanding posts that might be added to our FAQs.
You may also use this form to provide feedback or to call attention to messages that may be in violation of our content rules.

You must login to use this feature.

Inmate Login

By default, logging in will set a session cookie that disappears when you close your browser. Clicking on the 'Remember my Moniker & Password' below will cause a permanent 'Login Cookie' to be set.

Moniker/Username: The Name that you picked or by default, your email. Forgot Moniker?	Examples "Rapper", "Bob W", "joe@aol.com".
Password:	Forgot Password?
	Remember my Moniker & Password ( What's this?)

If you don't have an Asylum Account, you can create one by clicking Here.

Our privacy policy can be reviewed by clicking Here.

Inmate Comments

From:
Your Email:
Subject:

Message Comments

Original Message

RE: Plate chokes for 10k Rp type tube

Posted by mqracing on December 6, 2016 at 19:35:54:
Hello Shane:

First let me ask a few questions about your application. I'm going to assume that this is a voltage amplifier whose plate will feed the grid of a succeeding tube (power tube?).

How will it be coupled to the succeeding tube? RC coupling? LC coupling? transformer coupling?

If transformer coupling tell me what the nominal impedance of the primary winding is.

If say your RC coupling... one rule of thumb to begin to estimate how much L you want in the plate choke is too take the value of what would be an appropriate plate load resistor for your operating points. Once we have that value it is a matter of calculating how much L is necessary to have that much inductive reactance at your lowest frequency of interest (say 30 hz).

At four mils of dc bias current... it's not going to be terribly difficult to be able to get a substantial amount of L and to keep the unit physically (relatively speaking) smallish in size. There are a wide range of design strategies and tricks that I can use to keep the C "small"... I don't anticipate a problem here from what I am now picturing.

Pricing is of course reflected in the course of action I take in wishing to minimize capacitance... the advanced strategies add to the cost of winding the coils. I would also recommend our PLUS strategy used in plate chokes and other special inductors. This involves winding symmetrical twin humbucking coils that are electrical equals but of opposite winding phase.

with the plus coil construction your capacitive gradients (potentials) will be the same irrespective of which one of the two lead wires you orient toward ac ground or ac high.

MSL