[JN] Parallel Tubes

Guido Tent _ TentLabs Guido at tentlabs.com
Wed Dec 31 15:37:50 CST 2008


On Dec 31, 2008, at 10:32 PM, <pentode at netscape.com> wrote:

> hey-Hey!!!,
> The cathode current from a single cathode is quite enough to  
> overheat the plate. If one cathode is doing more than half, the  
> anode heat is still going to get distributed across the plate.

do I understand this is the integrated un-balance indicator ?

cheers

Guido

> cheers,
> Douglas
>
>
> --- Guido at tentlabs.com wrote:
>
> From: Guido Tent _ TentLabs <Guido at tentlabs.com>
> To: Phil Townsend <philji at mac.com>
> Cc: Volt Second <voltsecond at hotmail.com>,        Hans Hedal  
> <hans.hedal at post.cybercity.dk>, pentode at netscape.com,         
> joelist <sound at lists.io.com>
> Subject: Re: [JN] Parallel Tubes
> Date: Wed, 31 Dec 2008 21:09:10 +0100
>
>
> On Dec 31, 2008, at 5:16 PM, Phil Townsend wrote:
>
>> But the 6C33C-B is a low impedance device which is parallel-coupled
>> inside. And there are of course no built-in resistors to secure equal
>> current sharing between the two halves of the tube.
>>
>> How could the makers of the 6C33C-B (and other internally parallel
>> connected tubes) be sure that their tubes are not working completely
>> unbalanced (with significantly reduced lifetime and other problems)?
>
> they couldn't............
>
> Guido
>
>>
>> Yes, Exactly, my question as well.
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>
> Guido Tent
> Guido at TentLabs.com
> www.TentLabs.com
> www.Grimmaudio.com
>
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Guido Tent
Guido at TentLabs.com
www.TentLabs.com
www.Grimmaudio.com

Strijpsestraat 94
5616 GS  Eindhoven
The Netherlands

P +31 (0)40 2130 186
F +31 (0)40 2130 187
M+31 (0)6 2466 5125



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