[Amps] What is max grid current for YC-156 ??

[Alek Petkovic]

I have not fired mine up yet but on my mate's 156, we have 6kV on the 
anode and at 1kW out, there is little or no discernible movement of the 
grid current meter. The meter is scaled for 500mA FSD as the rf deck 
previously had a 4-1000A in GG config.

Anyway, for what its worth, for the 1kW power that my mate runs,  the 
grid current meter that he has in his deck is of no value whatsoever. A 
25mA or so FSD meter might be more appropriate in his case.

Perhaps when you up the anode volts on your mate's amp, the grid current 
readings will drop.

Sorry that I can't help more than that. All the literature that I have 
seen gives no real clue either.

K7RDX might be the man. He has built a number of YC156 amps.

73, Alek
VK6APK

On 24/03/2013 7:29 PM, Jim Thomson wrote:
> ###  yes, and it for pulse operation.   It appears it might be 100ma, 
> non pulsed.
> But under typ operation it shows 30-40 ma.. and this is pulsed, and 
> average during the
> pulse.  Max grid current is listed as  +/- 100 ma.
>
> ##  I also looked at the 3CX-5000A7... and it has a 50 watt grid 
> rating.... but no max grid current.
> The yc-156  is  listed as 25 watt max grid diss.   So I don't know 
> what to believe.
>
> Jim  VE7RF
>
>
>
>
>
> -----Original Message----- From: Rob Atkinson
> Sent: Sunday, March 24, 2013 3:56 AM
> To: Jim Thomson
> Cc: amps at contesting.com
> Subject: Re: [Amps] What is max grid current for YC-156 ??
>
> Isn't there a data sheet for that tube?
>
> 73
>
> Rob
> K5UJ
>
> On Sun, Mar 24, 2013 at 1:26 AM, Jim Thomson <jim.thom at telus.net> wrote:
>> A buddy just fired up his hb YC-156 today.  So far, so good.   What 
>> is the max safe grid current for this tube ?? 
>
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> Amps at contesting.com
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>

-- 
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