Amphenol no longer makes the 91 series conenctors -- they sold that product line to WPI in the 1980s.
Conenctor tooling and production still exists in Salem, NJ -- same plant and personnel.  They were performing "production runs" of these connectors -- at one time.  Web link for catalog and plant site:
http://www.wpi-interconnect.com/salem.htm

"In the '80s WPI acquired several commercial product lines from Amphenol. These products are still produced today at the  WPI Salem facility, which operates under an ISO 9002-2000 registered quality system."

w9gb

When you need electronics parts -- you have to have the catalogs (e.g. Allied, DigiKey, Newark/MCM, Mouser).  The former days of the "local" Radio Shack store having your parts -- are long gone (rarely existed 30 years ago).  Larger cities will have one or two good electronic distributors that will have a counter (just like your auto supply stores) and MAY have a small retail operation.  TriState Electroncis in Mt. Prospect is a good one in the NW Chicago suburbs.

These 24 volt bulbs are readily available from Mouser or ANY Chicago Minature distributor/dealer.  
http://www.chml.com/

Even Alpha Radio Products had stock in Colorado -- when I toured there last year.
http://www.alpharadioproducts.com/shop-main.asp

Alpha used YELLOW and GREEN vinyl caps over the bulbs.  Alpha has these -- and not uncoomon to have to reaplce them with a new bulb (IF you can not remove from old bulb).

w9gb

That was the Dutch language version, here is the English:

http://www.xs4all.nl/~pa0fri/Ant/R5/onhr5eng.htm

w9gb

The Dutch web site for Cushcraft R5/R7 has moved to:

http://www.xs4all.nl/~pa0fri/Ant/R5/onhr5.htm

w9gb

Don -

Yes, it is.  Many amateurs asks me - "Why are they so expensive?"
Part of the answer is that larger power output - which requries larger capacity power supplies (voltage and/or current) - which make sense since you are converting that electrical power into RF output with an efficiency most often in range of 50% to 60%.

The output filters also have to be increased to handle capacity (RF out).  In addition, almost all of the comemrcial 1 kW or greater amplifiers on the market ADD an automatic antenna tuner (not cheap) and band switching - and these added features come with a price.

Don -

I believe you are under the false impression that the ALS-500M is greatly different from the ALS-600 .. It is NOT - they actually share many parts.

Major difference:
ALS-500M is deisgned for mobile (auto/portable) installation - SO the RF transistors used run off 12/13.8 VDC

ALS-600 is deisgned for fixed usage and uses RF trasnsistors rated at 48/50 VDC.  the advantage is smaller guage wire (lower curent) due tot he higher voltage.

As for the Tokyo Amps - they currently do NOT have a North American distributor and their devices were NOT FCC certified - last time I reviewed.
There have been regular questions from amatuers that own these Tokto amps (self imported) - trying to find service - without shipping overseas (back to Japan).

IF you desire a 1 kW solid-state amplifier - then the Icom PW-1 or 4KL; Yaesu Quandra woudl be my recommendations to you.  At these power levels, cmmercial manufacturers (e.g. FM broadcast trasnmitters) use 48/50 VDC or high voltage RF devices .. to reduce current and wire size/weight. Ohm's Law still applies in the real world  P=IE,  E=IR

g. beat

Some of the people that I started with in computer networking (early 1980s), would tell you that if you substituted the work LAN (Local Area Network) for "ham radio" the comments are the same.

You should reading the IEEE Engineering Editorials and talk to Deans of Engineering and Science Colleges.  

This is a larger question than just amateur radio -- and will change US global role in the 21st century.  The "aging populations" of western Europe and US/Canada are a factor that some respondents have mentioned - as well as humans are living longer (thanks to 20th century medical breakthroughs)!    

What is common (taught at good business schools) is that new technologies, products and services go through a "life cycle".  
When it reaches its "maturity" stage -- it can be "sustained", "revitalized", "revamped" or replaced for a variety of reasons (largely driven by productivity or cost - economics).

gb

AWG #6 stranded is readily available at electrical distributors and local Hoem Depot, Lowe's and other large hardware stores. **It's not cheap - but copper and commodity metals are at records high rates (current world demand/supply).

AWG #14 7-strand wire is very good for antenna wire usage, IF it is not under tension.

Gene -

SAME ISSUES as your 13.8 VDC power supply in the amatuer radio shack .. linear versus switching .. 2 totally dfiferent technolgoy appraoches to providing required voltage and current for the ALS600 solid-state amplifier.

Computer industry already made this decision in early 1980s: Switching (weight and size).

RADIO has the issue of proper filtering of a SWITCHING power supply (not creating hash in middle of 20 meter band).

Swtiching got a bad name due to cheap computer power supplies that "cut corners" - by leaving out filtering components.
Same poor old "sucker trick" that occurred with linear power supplies (inadequate heat sinks), mobile 11 meter linears (no filter or bias) over past 30 years -- if the consumer is not smart enough - consumer just happy product is cheap. (caveat emptor - Latin for "let the buyer beware")

gb

Henry (KA3MUF) -

Although Kenwood no longer makes the TU-79 CTCSS board (discontinued) - you have good luck!

PIEXX makes 13 different plug-in replacement CTCSS boards for Kenwood, Yaesu, and Icom radios.
http://www.piexx.com/index.php?main_page=index&cPath=6

The "drop-in" replacement for your Kenwood is the TU-79px for $59.00
http://www.piexx.com/index.php?main_page=product_info&cPath=6&products_id=17

The TU-79 tone encoder allows you to add three tone frequencies, out of the 39 standard CTCSS sub audible tones group, to your TR-7950 / TR-7930 transceiver. The TU-79PX tone encoder retains the same physical dimensions as the original TU-79 making installation a breeze. The TU-79PX kit includes the mounting hardware and cables, everything you need for the installation.

If you include the three tone frequencies that you will be using, in the comments section of the order form, we will be happy to ship you tone board set up on these tones.

You can VIEW the Installation Instructions - with photos (before purchase)
http://www.piexx.com/tu79/tu79i.html
================
The other option is Communications Specialists, Inc.
http://www.com-spec.com/index1.htm

Top quality California firm that has been supplying CTCSS boards for land mobile (Motorola, GE, Johnson, RCA, Mand amateur radios since the 1970s.
[Product instruction sheets are second web links - below]

SS-64 is an internally (radio) mounted CTCSS ENCODER
http://www.com-spec.com/ss64.htm
http://www.com-spec.com/insheet/ss64inst.pdf

TE-32 enternal CTCSS ENCODER box
http://www.com-spec.com/te32.htm
http://www.com-spec.com/insheet/te-32.pdf

IF you also desire CTCSS DECODING (quiet squelch) - then the TS-64 is a very good choice.
http://www.com-spec.com/ts64.htm
http://www.com-spec.com/insheet/ts64inst.pdf

HOOKUP instructions for Kenwood TR-7930 or TR-7950 radio (SS-64)
http://www.com-spec.com/insheet/tr7930.pdf
=================
w9gb

I would have recommended a Triode Control Board (but space may be an issue) - although reading and looking at their schematics may give you an appropriate idea.

G3SEK Triode Board (Tom's Tubes is US distributor)
http://www.ifwtech.co.uk/g3sek/boards/triode/triode-1.htm

G3SEk ordering
http://www.ifwtech.co.uk/g3sek/boards/triode/triode-2.htm

WD7S Control board
http://home.earthlink.net/~wd7s/triode_control.htm

A high wattage operating bias circuit is required to tame the high static plate current the GI-7B tubes will draw. Typical bias voltage will run between 24 -30 volts depending on the desired resting plate current.

All details encountered in this experiment could not be written in this short article. It would be impossible to accomplish this. Some of the details and obstacles you will encounter quite possibly may not parallel the problems I encountered in this project. Undertaking and completing a project such as this is rewarding but often times exasperating. There is no cut and dried way to accomplish a project such as this. Your way might be far superior to my methodology and execution.

Good luck,

Lawson Summerrow / W4EMF

Roalnd -

Have you contacted Lawson, W4EMF ?  He usually is very helpful on these minor questions.

Jeff -

Steve mentioned that you will have to build a good power supply for the tube.  I would HIGH RECOMMEND that you use a GOOD PA control and protection board for the conversion -- like the G3SEK baord (One model for Triodes and another for Tetrodes).  You can read the product reviews for these boards here on eHam.net

You can downlaod the manuals (if you wish to read before purchase)
http://www.ifwtech.co.uk/g3sek/

Tom's tubes sells the G3SEK baords for US amateur builders.

w9gb

As you already know from this identical question on QRZ - no - does not go beyond 150 MHz

Hayboer in Grand Rapids Michigan - will rebuild it
http://www.heyboertransformers.com/index.shtml

for around $75 to $125 (with return shipping).

Good service!

w9gb