Jump to content

stax t8000 clone (well sorta)


Recommended Posts

using Kerry's servo, but a resistor to make +200

by the way the alternate name of this board will be t8000DR   (DR as in done right) :D

edit: fixed font sizes

 

 

 

kgsshbcarbontubeinput.jpg

Edited by kevin gilmore
  • Like 10
Link to post
Share on other sites
  • Replies 253
  • Created
  • Last Reply

Top Posters In This Topic

Top Posters In This Topic

Popular Posts

Now with top plate.     Aerial view, the two holes in front of outer small tubes are for balance trimmers. Adjust balance after some time of warm up and then insert jumpers for the ser

Well its not like the stax mafia aren't busy and we certainly are not going to do an output stage with 8ma of current, and therefore no reason for a 4 stage amp, and since tube inputs seem to be

using Kerry's servo, but a resistor to make +200 by the way the alternate name of this board will be t8000DR   (DR as in done right) edit: fixed font sizes      

Posted Images

58 minutes ago, kevin gilmore said:

looks like the best I can do is about 5.7 inches

current gg board is 4.7 inches

 

Thanks for taking the time to look into that, Kevin.

Will gladly work around the larger dimension on my end (new cases) when this new tube input GG happens.

Got a gut feeling this will be a killer amp! 

 

Link to post
Share on other sites

far too many projects to keep up, but it's always so tempting once you see the artwork...

i remember reading that kevin was championing the el34 ccs in the megatron, should wire that in instead so everyone gets the tube complement they want even if it's not the grounded grid output. kidding of course, even if it does sound monstrous.

Link to post
Share on other sites

I was thinking to build one adjustable DC supply to use some P88CC or 6N23P. Those have much more reasonable prices.

Filament will sit a little bit at negative. So negative LDO is preferred? 

 

Link to post
Share on other sites

Looking good @JoaMat :)

Here's the new schematic with the updated servo.

CaptureV3.thumb.JPG.cdcad2a422cc36a9c0c9ef76c50f6b9c.JPG

It would be very much appreciated if some folks could check Kevin's boards against this schematic.  Thanks :)

EDIT:  Updated schematic to match transistor values.

Edited by Kerry
  • Like 4
Link to post
Share on other sites

Great,

a new version of offset servo. I can’t remember how many versions we have seen so far, but as I remember one of the first was found in Kerry’s KGST (and Stax T2 of course).

  • Like 1
Link to post
Share on other sites

Any chance to shave just a few more mm off the length of the tube input Carbon boards? Maybe on the left side the zener string has space to be moved and the traces adjusted a little? Then I would be able to squeeze it into this standard size ebay case, which has 300mm internal length: http://www.ebay.com/itm/122099811096 

  • Like 1
Link to post
Share on other sites
10 hours ago, Kerry said:

check Kevin's boards against this schematic

minor differences: board looks good, don't see any problems

board uses resistor + zener string instead of U10

D3 has a 350K resistor to ground

connection of R15 changed  and values of that and R16 adjusted

Q7 Q8 Q9  Q10 are KSA1156 instead of  STN9360 on schematic

trimpot added to R12 for offset

Q13 collector has an added 100k 2W resistor

Edited by congo5
silkscreen reading error
Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


×
×
  • Create New...