[Amps] Reply to Marty

[Carl]

Swingers are most often 5:1 such as 5-25H, 6-30H, etc but some are 4:1 and 
6:1 but rarely any higher in my hands on experience for amplifier service.

The minimum inductance requirement is explained in all older handbooks and 
this site using PSU Designer which works well for our needs as well as the 
audio folks.
http://www.duncanamps.com/software.html

Carl
KM1H




----- Original Message ----- 
From: "Bob" <bobt at iafrica.com>
To: <amps at contesting.com>
Sent: Sunday, March 18, 2012 12:47 PM
Subject: [Amps] Reply to Marty


> Hi Marty I get my emails bounced from your Email address so...here is the
> reply I tried to get to you on swinging chokes.
>
> Hi Marty glad you liked my first reply.
> Swinging chokes are normally rated on a 5 or X10 ratio of current, with 
> the
> normal full load current being at the minimum inductance value or 
> somewhere
> in between. I.E. a choke rated for 1 amp with a value of inductance 
> of(say)
> 0.1H at 1 amp, and a value of 1H at 0.1 amps. It all depends on the design
> of the choke and what duty it will be required for. The higher the value 
> of
> inductance the lower the value of critical current the that the L C filter
> will have. This value of current is the value at which the DC  output
> voltage will drop from peak to average voltage. This value of current is
> what you need to have as a bias current (either by bias resistor or tube
> standing current). If you have this then you have a very stable DC voltage
> to feed the tubes. This is very desirable but does lead to having a boat
> anchor  of an amp. Thus a swinging choke will allow the best of both 
> worlds.
> Lighter weight but good regulation.
> Regards Bob
>
>
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