Custom Amplifier

[Drifter]

Ok.. If you were having a custom 3CX3000 amplifier made. What features would you ask for?

 

[Captain Kilowatt]

It would have to include a tin foil hat and lead lined underwear.

 

[Drifter]

It would have to include a tin foil hat and lead lined underwear.

lol ok... Those are accessories not features.:laugh:. Seriously what features would you ask for?

 

[Bionic Chicken]

Vacuum variables, vacuum contactor for HV, of course time delay, cover interlocks for your protection, variable tuned input, oil filled caps in HV supply, high temp and grid current shut off, just to name a few. Oh yeah, if you use a F7 tube instead of a A7 you won't need a socket. It just bolts to the chassis.

 

[n8fgb]

Vacuum variables, vacuum contactor for HV, of course time delay, cover interlocks for your protection, variable tuned input, oil filled caps in HV supply, high temp and grid current shut off, just to name a few. Oh yeah, if you use a F7 tube instead of a A7 you won't need a socket. It just bolts to the chassis.

Sounds a lot like my project. using the WD7S triode board, with all the features u mention. I am using 25 amp SSR's for the stepstart. Russians have a very nice filter cap, that I think is better than an oil filled. Of course vacum T/R relay for QSK.
Rich

 

[Bionic Chicken]

Sounds a lot like my project. using the WD7S triode board, with all the features u mention. I am using 25 amp SSR's for the stepstart. Russians have a very nice filter cap, that I think is better than an oil filled. Of course vacum T/R relay for QSK.
Rich

Cool. After thinking a little more in addition to the grid shutoff it would be good to fuse the grids and HV (glitch resistor) also. Everything that can be done to protect the amp components in case of an arc or short. A fuse is much cheaper than components. I had found a schematic for a decent HV supply at this link:

http://w2dtc.com/w2dtc-3cx3000f7/2006-0522-schematic-5000v-supply.jpg

W2DTC RF Amplifier Hotlinks and photos

The amplifier page has some things to drool over also. I really like the 4-1000 amp with 2x4-1000's for modulators. That would be a monster.

 

[n8fgb]

Only a fool would not include a glitch resister in his design.
Rich

 

[GunSlinger338]

what about echo ??

 

[W5LZ]

...and probably as important as all those 'extras', make the thing so that all those fuses, replaceable items, etc, are accessible!
- 'Doc

 

[Bionic Chicken]

...and probably as important as all those 'extras', make the thing so that all those fuses, replaceable items, etc, are accessible!
- 'Doc

That is correct. It sure is a pain to have to dismantle an amp to change a minor part like a fuse.

 

[loosecannon]

ROFLMAO @ gunslinger!

that was too funny dude!
LC

 

[Drifter]

Thanks for the serious replys. I will keep ur suggestions in mind when placing the order.

 

[Captain Kilowatt]

what about echo ??

On an amp??

 

[W5LZ]

QRN,
Yeah man! That thing's so big, any sound around it just echos in that box....
- 'Doc

 

[Bionic Chicken]

I agree it needs an echo. The controls need to be mounted inside the RF deck also. That would kill two birds with one stone.