Alpha Power ALPHA 89 Spécifications

By Matt Erickson KK5DR Copyright © 2004 M.A. Erickson, KK5DR. All rights reserved.

Fig.5 In Fig.5, the interior of the power supply side of the amp is shown, with the power transformer removed. The letter "E" points to th

I have suffered a catastrophic loss of an amplifier due to lack of surge suppressors in the past so, I believe in them, and use them extensively. I i

In Fig.6, Letter "A" points to the 28Vdc regulator, which was an LM-317T, good for about 1.5A. @ 32Vdc. The schematic calls for an LM-350T,

Now, we move to the blower, which is rated at about 40CFM under normal conditions, with the "aux" fan installed, the flow is upped to about

In Fig.8 you see an example of the panel rocker switches. After I examined the switch, I found that the blade of a small screw-driver could be insert

modifications. The pot is placed in series with the ALC line to the ALC jack, seen just below the ALC pot. I can't stress this topic to strongly

Any legal-limit amplifier should always be operated on 240Vac mains. Here is a list of the transformer voltage & current outputs of the secondary:

RF section Fig. 10 Fig.11 Fig.10 is the

I do not plan to even attempt the conversion, as I have a lifetime supply of EIMAC 3CX800A7's, plus I don't think it can be done in a way th

Introduction Many hams have never heard of this particular model of ETO Alpha amplifier. A few have heard of it, but have never seen one, even fewer

The PIN diode T/R system of the 89 was upgraded from the system used in the 86. I am told that an 86 can be upgraded to become equal to an 89 for the

transmit, or vise-versa. The RX PIN diodes are much smaller, and have a greatly lower power dissipation rating, so are easy to damage, with even a few

If you wish to do this mod, you will have to consult others that have done it, or figure it out for yourself. The mod is not difficult for a technici

Plate choke In fig.1, the letter "C" points out the plate choke. The letter "B" points to an open-frame relay that switches in or

The yellow line connecting at the top of the network comes from the HV power supply. The bottom of the network connects to the base of the plate choke

from ever happening. The letter "A" points to the RF input coupling capacitors, which are a pair of 0.02µF @ 1kV disk caps. A single 0.01µF

I took some time to trace and re-designate the proper part numbers on the schematic, this should help me allot, later. Over-drive There is an LED in