>Rich wrote:
>
>> The work-around is to plagiarize the split-chassis transverse 6" fan
>> cooling system used in the Heath SB-220. The glass envelopes will run
>> way cooler, the amp will run quieter, and there will be no expensive
>> glass chimneys to buy.
>
>Nah nah... no thanks... I think the issue is the temperature of the plate
>seal
Would the fins on the anode/plate radiator work better with vertical
airflow or horizontal airflow?
>and the pins seals... I'd also prefer to have the same temp air on all
>sides of the tube.
>
>You should read the description of how HOT the Henry folks intend to run
>these
>tubes - *very*.
>
- Henry Radio, Co. uses glass chimneys with noisy centrifugal blowers.
>I've got a nice quiet "squirrel cage" fan for the bottom... expect it do do
>way better than a muffin fan blowing across ... unless I'm missing something
>about the Heathkit method?
>
I too scoffed at Heath's cooling method until I inspected the ink marking
on the glass envelopes after months of service. In a Henry 3K-A the ink
quickly turns brown, In my SB-220, I use Amperex 3-400Zs that were mfg
in 1967 and 1978, the ink is still green, the vacuum is good, and the
emission is still ok.
- To see the principle behind the Heath cooling system, light a candle,
hold a paper-towel roll's core-tube in front of the candle, and see if
you can blow out the candle.
>I'm going PICKLE style! :- )
>
> _-_-bear WB2GCR
>
>>
>>
>> >
>> >Wondering if anyone can suggest an inexpensive source for chimneys for
>> >the 3-400/4-400 type tubes? Especially cheap imports. :- )
>> >
>> >Or if anyone in the US has a pair they want to blow out...
>> >
>> >Or if anyone has a DIY solution...
>> >
>> > _-_-bear
>> >
>> >
>> >
>> >--
>> > _-_-bearlabs
>> >
>> > http://www.bearlabsUSA.com
>> > - Silver Lightning Interconnects & Custom Mods -
>> >
>> >
>> >_______________________________________________
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>> >Amps@contesting.com
>> >http://lists.contesting.com/mailman/listinfo/amps
>> >
>>
>> - Rich..., 805.386.3734, www.vcnet.com/measures.
>
>
>
>
>--
> _-_-bearlabs
>
> http://www.bearlabsUSA.com
> - Silver Lightning Interconnects & Custom Mods -
>
>
>_______________________________________________
>Amps mailing list
>Amps@contesting.com
>http://lists.contesting.com/mailman/listinfo/amps
>
- Rich..., 805.386.3734, www.vcnet.com/measures.
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