Viking I / 829B help please

[Bill Abate]

Al,

Here is the 829B info from my Viking I:

CW operation with 115 V cycle ac input.

FREQUENCY    28mc

P.A. CATHODE CURRENT  230 ma.

SCREEN GRID VOLTAGE   225 volts (loaded)

P.A. PLATE VOLTAGE    660  volts (loaded)

P.A. GRID CURRENT    12 ma.

P.A. GRID BIAS     -97 volts

POWER OUTPUT  95 watts


Phone operation with 115 V cycle ac input.

FREQUENCY    28mc

P.A. CATHODE CURRENT  230 ma.

*SCREEN GRID VOLTAGE   225 volts (loaded)

P.A. PLATE VOLTAGE    620  volts (loaded)

P.A. GRID CURRENT    12 ma.

P.A. GRID BIAS     -97 volts

POWER OUTPUT  87 watts

MODULATOR CATHODE CURRENT   80 ma. (no signal)


       *13,000 ohm screen dropping resistor used.


Hope that helps.

73, Bill, K3PGB



N5AIT Allan Stephens wrote:
>
>      Well, I got the Viking I with the 829B mod going... but
> still need info on the mod - in particular, what should the bias
> be on the thing?
>
>      In the Vikings this is set using a tap off a fixed resistor,
> adjusting until the correct "resting" plate current is achieved.
> I do not think this was done on this one when the change from the
> 4D32 to the 829B was made: the resting current seems fairly high
> to me, particularly comparing similar thing on my Viking II.
>
>      Any help appreciated - what current should I be looking for
> on the 829B (resting current) - what should the bias be?
>
>      TIA
>
>      73,  Al  N5AIT
>   modsteph at acs.eku.edu
>
>     ...then I can get back to the Signal Shifter puzzle....