New here, first post.
I have some betsy k's in DIY MLTL enclosures. I previously used a RH-84 SEP amp with them. I liked the combo but, I'm wanting a SET amp.
I've read all the info on the Zkit1. It looks like it would work well with the speakers.
I have a few questions about the OPT's, Hazen Mod and Upgraded caps.
I read a post that stated the Hazen mod is on the new board. Is this correct?
Will the 6ohm 8k opt's be ok with the Betsy k's 8 ohm drivers? If not what should I use?
What upgraded caps are being used and where?

Looking forward to building the amp. Thanks for any info and help.

Mark

Hey Mark

Welcome!  Here's what I know...

The Hazen mod IS on the new board, as well as the virtual CT for the AC heaters.  Hazen mod uses two of the 4 Cornell Dubilier Polyester Film Capacitors 400V .1UF in the BOM.

Not sure on the OPT's.  I'm using the 6 ohm OPT's into 8 ohm speakers...seems to work fine for me.

I believe Steve is now using the Jupiter HT-Series Beeswax Paper Aluminum Foil Capacitors for the coupling caps.

http://www.partsconnexion.com/capacitor_film_jupiter.html

They are $33.25 each (plus shipping).  I'm using them.  Can't remark on the improvement, but others may be able to discuss this further.  You can always try the Cornell Dubilier's first.  The upgrade is easy to do.  

Hope this helps.

Mike

Yes you can.  Here's a link to an article that describes any small advantage a virtual CT would have.

http://www.valvewizard.co.uk/heater.html

Good Luck!

Mike

I have another question. On the Hazen mod the caps goes from pin 6 to pin 3 on the SV83. Does that sound correct? I looked all over the forum couldn't verify what's done.

Mark

I have all the parts ordered. Just have to wait for edcor to build the transformers.

Mark

Amp is finished and working great. Zero hum. I'd post a pic but, I don't have a photobucket account. Love the amp.  :)

Mark  

Congrats, Mark!

Other than the coupling caps, did you do any other mods?

If you have a picture, just attach it to your post.  The main issue is the file size.  I use Windows Paint to reduce the pixels, until the saved picture is below the 350 KB size.

Mike

Pic. I got it to work!  ::)

Thanks!!

Mark

I've been using the amp for 6 months now. It's performing well. Just wanted to update. I have just finished building Pensil's with Alpair 10p drivers. Although the 10P's are  89.7db spl, the amp works very well with them. SQ is greatly improved over the BetsyK's. It's a good combo for smaller listening rooms.

Mark