looking for RM italy kl 503 HD Schematic

[KD2GOE]

Any one have High Rez pics of the inside and a schematic of the KL 503 HD
it looks like for some unknown reason the adds say it is still 1 driving 8?
i am guessing they added more padding to get the "35 watts input drive"?
to me it seems like just removing the Driver like i have done would had been cheaper ¯\_(ツ)_/¯

 

[Tallman]

Schematic! It is 0ne driving Eight.

 

[KD2GOE]

Schematic! It is 0ne driving Eight.

yeah that's the one i have for the normal low drive.. looking for the high drive..

 

[mark cournoyer]

can any body help me with mike radio repair address

 

[mark cournoyer]

can any body help me with mike radio repair address

 

[PA2AR]

I'm also interested in de schematic of the HD version. It is not published on the manufacturers website.......

Just found a recent review of the HD version on YT:
I was surprised to see the specifications on the front of the booklet at 3 min 29 sec.
It looks like the used transistors are the same as in the non HD version: one RM4 drives 8 RM3 mosfets.
Did they just add a fixed attenuator in the input to increase the max. drive to 35W?

Then another question that many may have: What are the RM3 and RM4 MOSFETs?
The IRF520 is mentioned often, nut I also read about the 13N10 (FQP13N10 I assume).
Any information here would be appreciated as I have one of these amps for repair on my desk.

 

[W1AFG]

I am interested in buying the KL503HD, but they are hard to find nowadays. Any ideas where i may find one new. Thanks in advance.

 

[Robert Cook Sr]

I'm also interested in de schematic of the HD version. It is not published on the manufacturers website.......

Just found a recent review of the HD version on YT:
I was surprised to see the specifications on the front of the booklet at 3 min 29 sec.
It looks like the used transistors are the same as in the non HD version: one RM4 drives 8 RM3 mosfets.
Did they just add a fixed attenuator in the input to increase the max. drive to 35W?

Then another question that many may have: What are the RM3 and RM4 MOSFETs?
The IRF520 is mentioned often, nut I also read about the 13N10 (FQP13N10 I assume).
Any information here would be appreciated as I have one of these amps for repair on my desk.

88 Radio has RM3 & RM4 for sale

 

[Robert Cook Sr]

Any one have High Rez pics of the inside and a schematic of the KL 503 HD
it looks like for some unknown reason the adds say it is still 1 driving 8?
i am guessing they added more padding to get the "35 watts input drive"?
to me it seems like just removing the Driver like i have done would had been cheaper ¯\_(ツ)_/¯

Look in back of Manual for schematic

 

[Robert Cook Sr]

I am interested in buying the KL503HD, but they are hard to find nowadays. Any ideas where i may find one new. Thanks in advance.

88Radio