[TenTec] Hercules 444 amp

[Brian Carling]

Good tip. Thanks Bob.

Best regards - Bry Carling AF4K



> On Aug 10, 2014, at 6:27 PM, Robert <rmcgraw at blomand.net> wrote:
> 
> Please don't use used or pulls for a 2 tube amp.  The way they're designed one tube may be drawing 60 Ma grid current and the other 200 ma. Yet a total of 260 ma would be normal. 
> 
> Grid to filament is the more common failure mode as the result of excessive grid current. 
> 
> Some one posted earlier about buying 2 used tubes and one failed after only a few hours.  It is reported to have taken out the bias ckt. Evidence of a grid to filament short. 
> 
> 73
> Bob K4TAX
> 
> 
> Sent from my iPhone
> 
>> On Aug 10, 2014, at 6:08 PM, Brian Carling <bcarling at cfl.rr.com> wrote:
>> 
>> Are there other sources for 3-500Z tubes? Such as NOS Eimacs? Or broadcast pulls?
>> 
>> Best regards - Bry Carling
>> 
>> 
>> 
>>> On Aug 10, 2014, at 2:08 PM, "Duane Calvin" <ac5aa1 at gmail.com> wrote:
>>> 
>>> This was certainly true of the EIMAC tubes, as long as you cared well for
>>> them.  I've not had as good a luck with the current Chinese-sourced tubes
>>> (specifically, the 3-500ZG's from RF Parts, which the Centurion uses.)
>>> 
>>>  73, Duane 
>>> 
>>> Duane Calvin, AC5AA
>>> Austin, Texas
>>> www.ac5aa.com  
>>> 
>>> 
>>> 
>>> 
>>> -----Original Message-----
>>> From: TenTec [mailto:tentec-bounces at contesting.com] On Behalf Of Wade Staggs
>>> Sent: Sunday, August 10, 2014 12:54 PM
>>> To: Discussion of Ten-Tec Equipment
>>> Subject: Re: [TenTec] Hercules 444 amp