Clark Beaufort split cathode voicing...

[lookah]

i recently bought a clark beaufort "ebay special" from mike clark directly and i'm loving it...it's a stunning amp.

with my little amp knowledge, i noticed that my amp varies from the standard 5e3 schematic in that it has a split cathode voicing. the "normal" channel has a 25uf cathode bias cap with the 1.5k resistor where as the bright channel has the marshellesque .68uf cathode bias cap with a 2.7k resistor. (the other difference from the original is that the coupling caps values are .022 instead of .1)

both channels sound wonderful but was just curious if that's how all the beauforts are wired...any other owners out there?

thanks!

[GTRJohnny]

Do you have any pictures? What speaker did it come with? I have his deluxe version and honestly never looked. I'm not sure I would know what I was looking for anymore... Sorry.. :o


i recently bought a clark beaufort "ebay special" from mike clark directly and i'm loving it...it's a stunning amp.

with my little amp knowledge, i noticed that my amp varies from the standard 5e3 schematic in that it has a split cathode voicing. the "normal" channel has a 25uf cathode bias cap with the 1.5k resistor where as the bright channel has the marshellesque .68uf cathode bias cap with a 2.7k resistor. (the other difference from the original is that the coupling caps values are .022 instead of .1)

both channels sound wonderful but was just curious if that's how all the beauforts are wired...any other owners out there?

thanks!

[lookah]

i bought the speaker separately. it's a weber 12A125A. basically the Jensen P12Q copy. here's a pic of the chassis layout directly under the "normal" input jacks. the 4 adjacent components to the far right are what i was referring to. a standard 5e3 tweed deluxe layout would only have the first two from the right.

http://www.thedang-itbobbys.com/luca/clark.JPG

[JDJ]

In talking with Mike, I had the impression that he started doing that only recently. If that helps.

[shuie]

Best thing to do is to call him and ask. He has used the term 'Special' on different amps. The 'Clark Special' on his website is not the same thing as the ebay 5E3 Beaufort 'Special' which is not really the same thing as this amp. The photo above looks like how he describes the separate cathodes of the pre-amp in the 25 watt 6L6 'Clark Special' he has listed on his site.

[lookah]

thanks guys. shuie i think you may be correct...i just read that description for the "special" and the ebay listing was indeed for a "Clark Beaufort Special". i'm now going to check if have the fixed bias PI as well...

well, regardless, i'm really happy with the amp and as he states, it is very gig friendly. using an ABY pedal with it as a channel switcher is also great....

[jetlag]

I'll have to check mine too. Bought it in December. I remember noticing different than stock value input coupling caps in mine too, but I think they were 0.047uf. I didn't notice split cathodes for the two inputs, but I'll have to recheck. Interesting.

[lookah]

no fixed bias PI in mine...so i evidently it's a variation from the "special" on the website

[shuie]

The 'Clark Special' on the website is a 25 watt 6L6 amp. I think you have a tweaked version of his ebay Beaufort 'Special'.

[lookah]

right...although i've been running mine on 6l6's as well with a 5v4 rectifier...sounds sweet!

[bhorn67]

I have the same amp but about three years older. Mine does not have the two additional components. I have a pic if you want me to send you one to compare. Brian

[Roe]

this sounds like mods in order to tame the bass a little

[donnyjaguar]

I really think this topic is much ado about nothing. If you really want to get into it Google on "group delay" in electronics.

[lookah]

I really think this topic is much ado about nothing. If you really want to get into it Google on "group delay" in electronics.

???