[Amps] 8875

[Carl]

Ive explained that several times.

Since the MLA-2500 is PS limited there is no sense in using two 3CX800's 
where a single already gives an extra 200W of PD over a pair of 8875's.

Mount a muffin fan on the top of the cabinet and a silicon rubber chimney 
from over the anode to the top. The existing fan will supply sufficient air 
around the base of the tube and the top fan will pull it up and out. Both 
can have the speed reduced quite a bit for a very quiet amp and about 1000W 
out.

Carl
KM1H



> Doesn't  the 8875 use a transverse air flow?  If so, how do you get proper 
> cooling with the 3CX-800 ?
> The electrical part is simple, but mechanically?
>
> 73
>
> Roger (K8RI)
>
>
> On 3/19/2015 8:46 PM, Carl wrote:
>> A single 3CX800A7 or the 3CPX version is an easier conversion since none 
>> of the extreme metal hacking for Russian tubes is needed; the socket and 
>> pin outs are identical. Plus the tube is much cleaner for IMD and full to 
>> 80% output (at 46 mHz) medical pulls are still fairly easy to find.
>>
>> Carl
>> KM1H
>>
>>
>> ----- Original Message ----- From: "Glen Zook via Amps" 
>> <amps at contesting.com>
>> To: "Juan Pablo Ravinale" <janlu5yf at gmail.com>; <amps at contesting.com>
>> Sent: Wednesday, March 18, 2015 4:03 PM
>> Subject: Re: [Amps] 8875
>>
>>
>>> Go with the GI-7bT variant if you can obtain them instead of the regular 
>>> GI-7b.
>>> You also might consider a single GS-31b. That tube has a plate 
>>> dissipation of 1000-watts instead of 700-watts which a pair of GI-7b or 
>>> GI-7bT tubes have. Glen, K9STH
>>>
>>> Website: http://k9sth.net
>>>      From: Juan Pablo Ravinale <janlu5yf at gmail.com>
>>> To: amps at contesting.com
>>> Sent: Tuesday, March 17, 2015 6:18 AM
>>> Subject: [Amps] 8875
>>>
>>> Dear OM`s:
>>>
>>> I have an old Dentron, and I need to buy two 8875. Can anybody help me 
>>> with
>>> this? If not possible, a pair of GI7B is a good choice?
>>>
>>> Thank you in advance.
>>>
>>>
>>> _______________________________________________
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>>>
>>>
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>>
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>
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