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In Reply to: RE: What about "characteristics and typical operation" posted by DAK on June 23, 2016 at 16:23:08
Once you start changing (massaging) resistor and voltage values the design is no longer the design, it's now your design.
As far as the tube it self, you can do anything you want as long as you don't exceed the limits.
Those limits are given on page 2 "maximum ratings".
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Follow Ups:
is the plate to plate feedback resistor. For the 6sn7 it was specified at 100k ohms from the anode of the kt88 to the 6sn7 anode. How does this feedback resistor affect the operating point of the 6sn7, and the kt88 when i change the plate resistor of the 6sn7 to a smaller value, i am going to start at around 30k.
Edits: 06/23/16
Dak
Answer a question.Were you planning on using one triode in each 6SN7 for voltage gain while the using the 2nd half as a follower?.If you CCS load one section of the 6SN7,you will get a gain of 20.I'd run it at about 8ma to 10ma.
I know you only want to get 12 watts but you still want it to be very linear and as far as operating points go,that is more affected by the DC voltage settings than the AC signal. Do you have a schematic to that circuit?
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
Hi Mike one section of the 6sn7 will drive the power tube, so, only a 2 stage amp Each 6sn7 will therefore drive the 2 se amps that make up the push pull pair for the output trans. The circuit is located here;
http://rh-amps.blogspot.com/2013/05/rh-universal-v2-totally-universal.html
thank you for your interest.
I know you want to build a PP amp with the drivers being single ended for half of the cycle to feed each output tube..If you look tho,they are using the 12AU7 as a voltage gain amp driver and I thought you wanted to use a cathode follower driver..Their circuit has gain and this is where I am confused.You need to use half of each 6SN7 as a voltage amp and the other half as a driver..If you paralled the halves of the 6SN7,you are just going to end up with a lower impedance driver or voltage amp,depending on how you use it.
I heard a superb sounding Single Ended KT88 built by a guy named Kegger and it used Edcor iron and it was driving a pair of ADS 780s but it sounded much bigger than the 10 or 12 watts is was rated at.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
There is no amp as such and i am trying to make one out of 2 of the single ended amps. Phase splitting will be done with a Lundahl input transformer and each mirror imaged signal will be handled by a se amp.
I have built 2 of these that are kt88 type and they sound excellent. So, i was thinking i would make a parallel single ended version to get the power up to 20 watts. Well, that's been done many times and i thought i have not read about anyone taking a se amp and using it as a basis for a push pull amp. So this is where i am now.
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