Yes I have always been told by G3UUR that an ideal turns ratio is
around 1.4:1
Now would that typically be with a centre tap on the primary side for
the P-P mod tubes?
In other words the 1.4 side gets a centre tap?
I am also looking at voltage ratios of suitable ready-made
old transformers...
In a message dated 10/12/04 6:02:49 PM, [EMAIL PROTECTED] writes:
> One thing I don't like about doing different things with tubes is there is
> no
> real info on running 813's triode connected.
> What's the distortion values?
>
>
See ER #57, Jan. 1994 for a set of curves and other info. on t
s real clean.
Brett
N2DTS
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Patrick Jankowiak
Sent: Tuesday, October 12, 2004 6:31 PM
To: amradio@mailman.qth.net
Subject: Re: [AMRadio] Mod xmfr
Ahh yes. The class-B 813 modulator. Glad to see it!
I'd
om: "Jim Wilhite" <[EMAIL PROTECTED]>
Subject: Re: [AMRadio] Mod xmfr
Check here:
http://www.amwindow.org/tech/htm/813/813.htm
That's it!!!
Joe W4AAB
- Original Message -
From: Jim Wilhite <[EMAIL PROTECTED]>
To: Discussion of AM Radio
Sent: Monday, October 11, 2004 7:53 PM
Subject: Re: [AMRadio] Mod xmfr
> Check here:
> http://www.amwindow.org/tec
Check here:
http://www.amwindow.org/tech/htm/813/813.htm
- Original Message -
From: "Crawfish" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>; "Discussion of AM Radio"
Sent: Monday, October 11, 2004 7:38 PM
Subject: Re: [AMRadio] Mod xmfr
I have info I
I have info I got somewhere off the web about K1JJ's pair of 813's modulated
by a pair of 813's.
Joe W4AAB
- Original Message -
From: Rbethman <[EMAIL PROTECTED]>
To: Discussion of AM Radio
Sent: Monday, October 11, 2004 12:07 PM
Subject: Re: [AMRadio] Mod xmfr
&
Considering the RF amp with 2 x 813's and the modulator with 2 x 813's -
what
are the equations and math to work out the required wattage, impedance,
step
ratio etc.
And, just how much can one depart from the ideal arrangement and with what
effects? ( should I not be able to find the right xm
Steve,
There was a series in ER (Electric Radio), by W3BYM, Tom
Marcellino. He built an AM 2-813s modulating 2-813s. It is a beautiful
looking and sounding rig. Very much in the class of T-368s or BC-610s.
Perhaps even better!
If interested, I'll hunt through the collection and get
The load that is represented by the final is Ep/Ip = load impedance in
ohms.
The tube manuals gives the proper plate to plate load impedance for a
given voltage and class of operation for your modulators.
The impedance ratio for your XFMR would be the
(PTP impedance) : (final EP/Ip)
Turns rati
Corrections to the last email:
Actually Steve, the idea is pretty simple. When using a class C final
amplifier the output RF voltage is directly proportional to the plate to
cathode voltage. Most of the time the cathode is grounded so we just
say "plate voltage" or "plate modulation". This mea
Actually Steve, the idea is pretty simple. When using a class C final
amplifier the output RF voltage is directly proportional to the plate to
cathode voltage. Most of the time the cathode is grounded so we just
say "plate voltage" or "plate modulation". This means that if the plate
voltage is d
> Hi all:
>
> I need to better understand the workings of a plate modulator for AM.
>
> Considering the RF amp with 2 x 813's and the modulator with 2 x 813's - what
> are the equations and math to work out the required wattage, impedance, step
> ratio etc.
>
> And, just how much can one depart fro
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