More 4-400 Stuff

[Wilson Lamb]

> OK, I found the link to the original.  Must have been a good book.  I 
> built many single, parallel, and pushpull amps using it.  I was 14 when it 
> came out.
>
> The 4-125 is an awesome little tube.  It would take nearly unlimited plate 
> voltage and glow white hot  if I held the key down very long.  It seemed 
> that the higher the plate voltage, the better it worked!  I drove my amps 
> with an old Collins 310-B, also awesome, which I still have!
> Wilson
> ----- Original Message ----- 
> From: "Paul Blumhardt" <k5rt at VERIZON.NET>
> To: <HEATH at LISTSERV.TEMPE.GOV>
> Sent: Monday, October 08, 2007 7:14 AM
> Subject: Re: OFF TOPIC, SORT OF
>
>
>> You can check for grid to cathode/filament shorts with an ohm meter.
>>
>> You can also check for control grid-screen-suppressor grid shorts
>>
>> Finally, most high power tubes have two grid pins - you can check for 
>> open
>> grid connections too. Don't forget you can check for open 
>> filament/cathodes
>> too.
>>
>> 3-500z, 572B and 811 are very common, so it should be easy to find a 
>> buddy
>> with an amp with those tubes to test your tube in. Even the 3CX1200/1500
>> amps are pretty common these days.
>>
>> Paul
>>

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