I don't believe there is a direct replacement. There is / was, on the web,
a mod to use another less expensive 4CX400A. It was writen by Bob Alper,
W6KT in 1996. It replaces the tube sockets

Seems do be dead now:
http://www.svetlana.com/docs/TechBul...hnoteNo14.html

Goran, SM2YER, lists other mods, but the links were too slow to respond for
me to look at them.
http://support2.overkalix.se/~sm2yer/shack/amp_mla2500/

Ahhhh! Here it is from a Google search 6/9/2006: T R U S T G O O G L E
! !

http://dk9ip.ba-karlsruhe.de/pdf/mla...hnoteNo14.html

Do a search on "Dentron MLA2500 Alper". Maybe it's still somewhere. I have
a soft copy. Here's an excerpt:

The major problem for MLA-2500 owners is that there is no economical source
for the 8875 tubes used as the active amplifiers. For under $350 including
sockets and tubes, the amplifier can be converted to run two Svetlana
Electron Devices, Inc. 4CX400A tetrodes. (The price of a Svetlana 4CX400A is
$140.) .
In performing the conversion, five specific needs must be addressed. These
a

- Modification of the final amplifier tube area.

- Adding a screen power supply.

- Meter switching board change.

- Adding a bias power supply.

- Installing the passive input grid circuit.


73, Steve, K9DCI


"Mitchell" wrote in message
...
Are there any replacement tubes available that are pin compatible with the
8875. I have the Dentron 2500.

Thanks,
Mitchell