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@contesting.com>
To: "Juan Pablo Ravinale" <janlu5yf@gmail.com>; <amps@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@gmail.com>
To: amps@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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