600L Schematic

[W8UJX]

Does any one have a schematic of the Central Electronics 600L 813 amp?
I want to build one for use with my Retro 75.
I would be glad to pay postage and copying cost.

Thanks,
Jerry, W8UJX

[KA0HCP]

http://bama.edebris.com/manuals/ce/

Use the Bama Mirror (main site is down)

[W8UJX]

Thanks Bill, 

I tried that site earlier but I must have screwed up somehow.
Your link works.

Jerry

[KM1H]

BAMA has been down for a few years when it was all transferred over to the Edebris mirror.

Carl

[WD5JKO]

Jerry,

   Those broadband couplers will be expensive. The last I heard, Nick Tusa still makes them.

http://www.ce-multiphase.com/

Email Nick:
nick.tusa@ce-multiphase.com

I might just make a tuned amplifier myself instead of a broadband one if starting from scratch. The 600L runs class AB2, grid driven. The Retro75 at 12V driving the 600L (with an extra 75 ohm load across the 600L input - important) will drive the 600L to ~ 70 watts AM carrier output with headroom for > 100% positive modulation. The 813 runs a dull red, and you need an exhaust muffin fan on the top to draw out the hot air.

Good luck with your project!

Jim
WD5JKO

[W8UJX]

Jim,

Thanks a lot for the info.  I have a few 813's laying around so I thought I would make an amp for my Retro 75.

Yea, it would be grid driven with a simple 80 meter link coupled input coil and 80 meter pi-net output circuit.

I was looking for the 600L schematic just to get an idea of the operating voltages, grid bias, screen etc.

I have never built a linear amp before because I have worked only CW.  I am anxious to try the mods to increase the modulation of the Retro and use it to drive a linear. 

I was also thinking of completely disconnecting the stock modulation transformer on the Retro and connecting the 16 ohm output tap of my HI-FI Heathkit amp in it's place to get some HI-FI audio.

I have been a ham for almost 60 years and love to tinker.  Hi... 

I built a power supply that puts out 2KV@500 mA, 360V regulated for the screen and -100V regulated grid bias.  I wonder if this a good place to start for the operating voltages for that amp?  The screen voltage is probably a little bit low.

Jerry, W8UJX