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This is a real long shot. I have an old Commander HF-2500 which I love very much. It is Serial Number 186 and it conforms with the printed manual and schematic of June 1990. However, there is no

Hi Francois, I did not document my changes and sold the amp a few years ago. I remember the green capacitor (B) but not (A). That could easily be a memory leakage on my side but I couldn’t

Hello I am weak in technology (I am 75 years old). It seems to me that you are pointing out the two curious plate capacitors A = C41 (47 pF) and B = C42 (307 pF). Could you give me,

The reason is in this message /g/ham-amplifiers/message/40898 -- F1AMM Fran?ois De la part de Evert Bakker via groups.io Envoyé : samedi 25 janvier 2025 19:38

I recently bought this L 7 (about $1000) from an OM who used it very little. It has the serial number 672. On this device, the air is sucked from the bottom of the case by a kind of scoop. It is a

Why do you want to see these tubes all the time? It is the most reliable amp I’ve had. You can push this amp to all its limits and beyond, it just won’t die. Even when it starts to stink

It seems your lid or top sheet metal has been changed. Mine has holes and I can see the tubes.

The top sheet metal is a solid sheet metal. You can see, very badly, through the fan. Removing the top panel: ok. To do a short test, it is a solution but in operation it is not reasonable, if

Take the top-cover off and use something to push the rod down so the HV will pass through. As long as you know what you are doing … (I shorted that switch) BUT TAKE CARE. There is no room for

You should be able to see them thru the top of the amp turning red.

Hello I am in the process of putting a Drake L 7 amplifier back into operation. I was advised on this forum to bring the anodes of the 3-500Z to red to maintain the quality of the vacuum.

In the same way that there are synthetic white noise generators, from a pseudo-random code, are there synthetic pink noise generators? This pink noise modulating in SSB seems to me to be a very

Excellent idea...... and I had forgotten all? about it.? ?My Behringer DEQ-2496? ( 24 bit - 96 khz)? mastering processor has a pink noise generator in it.? ?I checked my old notes, and when fed

I have a 2014 AL-82 and two of the components inside have manufacture dates on them. One was the power supply and I don't remember the other might have been the blower. [email protected]>

Hello, Can the vintage or date of manufacture be determined from the serial number on an Ameritron AL-82? Thanks and 73, Garry - K4OR

? Southeastern VHF Society 2025 Conference Announcement & Call For Papers Quality Inn , 3095 Wilma Rudolph Blvd, Clarksville, TN 37040 April 4th and 5th, 2025 Papers and presentations are

Another way to check for linearity is to use pink noise as an input: all frequencies in the pass band simultaneously. A perfectly linear system would reproduce exactly the input spectrum as the

Be careful when conducting 2 x tone tests.? You can easily manipulate / skew? the results by? manipulating the tone spacing.? ?Manufacturer's would do just that, years ago, to minimize IMD3 and

XCVR is an abbreviation for Transceiver MK-V is a Yaseu Transceiver L4B is a model of an old Drake amplifier DENON test cds are Compact Disks for DENON test equipment Abbreviations and model

Dimanche, 19 Janvier, 2025; 1148 EST Dear Francois, XCVR = Transceiver, a Transmitter and Receiver in the same box. Often referred to as "Tx or TX," and " Rx or RX" thus: