Marantz CD63 & CD67 mods list

[rowemeister]

Yes it's current and frequancy of the voltage that kills you.

240V at 50hz if across your body can make your heart try to beat @ 50 times a second etc etc

That defribulator thingy medics use to "get the heart working" actually momentarily stops the heart allowing it to get back to its own beat again.

sorry ill go away now

[poynton]

Originally posted by SimontY


Hmm, the schematic doesn't look *too* hard for a beginner to follow

Valves are easy too work with. Just remember the voltage !!!

On this circuit, the main thing is to use "good quality" components after the dac, matched as close as possible.


6h5c
I had something along these lines in mind for my balanced stage.
Self-balancing cascode with the output taken from cathode for low-z.

[6h5c]

Originally posted by SimontY
Very interesting Ray. Your amp looks well put together, a DIY job?

The only bad thing is I now feel maybe I need this "new level" before mine will be its best!

Hmm, the schematic doesn't look *too* hard for a beginner to follow

Hi Simon,

Yep, I built the amp myself. There's some more pictures of it (and me) here.

The advantage of tubes is that you need very few (passive) components to make a good working circuit. A simple common kathode circuit is stable and has enough bandwidth by itself already, and the amplification is not too high, so you don't need feedback to "fix" all that. I think feedback is a killer for the sound. Furthermore the characteristics of a tube are more friendly compared to a transistor. The same philosophy can be followed with transistors or FETs though.

The high voltages require a different approach to building, but once you get the hang of it, it's very easy. It's more mechanical compared to a PCB with parts, most circuits can be hard-wired.

Regards,

Ray.

[6h5c]

Originally posted by poynton
On this circuit, the main thing is to use "good quality" components after the dac, matched as close as possible.

I had something along these lines in mind for my balanced stage.
Self-balancing cascode with the output taken from cathode for low-z.

Hi Andy,

This is starting to look like the Tubes section....

Nice circuit, didn't know that one yet. Where did you find it, or did you design it yourself?
It has balanced inputs .
Technically you only have to buffer the output you are going to use with a kathode follower.
Will save you one triode . A bit like this one. I found it here.

Ray.

[poynton]

I think I got the idea from Kennedy Audio (?) on the web years ago.

I also have seen the circuit you posted.

( I try to avoid the site you suggested unless I have some time to waste - it takes such a long time to update !!! )

Andy


PS I like your pictures - a study in concentration !!

[6h5c]

Here's another one that uses part of the CD67 circuit.
It's in dutch: http://members.chello.nl/~p.gelderen...67/cd67out.htm

Haven't had any trouble with the site yet, strange.

Ray.

[SimontY]

Originally posted by 6h5c


Hi Simon,

Yep, I built the amp myself. There's some more pictures of it (and me) here.

Hehe, nice haircut Not how I imagined you'd look, lol

Your work looks extremely well done, I bet it sounds like it too.

[rowemeister]

Just looked at your pics Ray.......are you sure you know what you are doing.

Only joking mate. Very impressive

[rowemeister]

Oh and everyone needs this lol

http://babelfish.altavista.com/

[6h5c]

Originally posted by SimontY
Hehe, nice haircut Not how I imagined you'd look, lol
Your work looks extremely well done, I bet it sounds like it too.

Originally posted by rowemeister
Just looked at your pics Ray.......are you sure you know what you are doing.

Only joking mate. Very impressive

Originally posted by poynton
PS I like your pictures - a study in concentration !!

Thanks guys. By the way, i'm not in the military
Just have no curls

Ray.