Hi,
single stage SE EC86 audio amplifier.
2 x 6 watts
Regards
Rock
Looks good, and interesting . My first thought was "Ooh, circlotron?" Is the circuit simply 8 tubes in parallel? Care to say more about it? You like sound?
Modular Amplifier 1. There are several output boards providing over 150 tube choices, and all the elements are modules This one will use 6P45S.
I designed all of the black boards, the others are from China.
Ahh - I see. I was thinking about the Atmasphere MA-1 but it was not much like that amp-- ;-)
Nice compact 6C33C amp
Nice amp, tell more about it and schematic please!
Finished my new tube buffer. Aikido cathode follower PCB from GlassWare Audio Design formed the base for this build.
Tortuga Audio ePotV3 Mini with LDR module and apple remote is in charge of attenuation and is doing a great Job. Unlike the S....C.... LDR, the Tortuga has left/right balance as well and it is small enough to fit into the same enclosure. Build quality is of the highest standard. Input impedance can be selected upon ordering which is a bonus.
So far the buffer is doing a great job, is quiet and sounding very musical indeed.
Tortuga Audio ePotV3 Mini with LDR module and apple remote is in charge of attenuation and is doing a great Job. Unlike the S....C.... LDR, the Tortuga has left/right balance as well and it is small enough to fit into the same enclosure. Build quality is of the highest standard. Input impedance can be selected upon ordering which is a bonus.
So far the buffer is doing a great job, is quiet and sounding very musical indeed.
Attachments
Could you give the achieved technical characteristics of your amplifier and especially the harmonic spectrum? I also want to implement a similar project on the same lamps. Please provide the characteristics of the interstage transformer.Nice compact 6C33C amp
Thank you in advance and wish you continued success.
Could you give the achieved technical characteristics of your amplifier and especially the harmonic spectrum? I also want to implement a similar project on the same lamps. Please provide the characteristics of the interstage transformer.
Thank you in advance and wish you continued success.
I have yet to do distortion analysis, will post this later.
As to the amp itself:
- B+ is 220V after CRCRC, custom made power transformers
- drivers are 6J52P biased by 3 SiC diodes in the cathode, at 23mA or so
- 6C33C is on fixed bias via Pete Millett's regulators
I am running only half of 6C33C's heaters, don't ask how I ordered wrong transformers. I might try to stress the trafos for full heater current later, and/or I plan to try 6C41C's for outputs
- Signal transformers are from Silk Audio, IT's are I-511S, OPT's are S-1-6C33
Case mostly ordered from Rapiddirect
All in all very simple. I only had to go though a few 6J52P's to get a non microphonic loosely matched pair
Thank you for your detailed answer, I especially like your deeply grounded circuit solutions. It will be very interesting to see the characteristics of both options: 6С33С and 6С41С.All in all very simple. I only had to go though a few 6J52P's to get a non microphonic loosely matched pair
Nice compact 6C33C amp
Clean and very elegant.
6SJ7 drivers with Zener regulated screens. 6BG6 single ended pentode. Power tube screen and driver tube voltages are regulated by VR tubes and MOSFET follower. 10% shunt feedback, a little GNFB. This is not Hi-Fi. It's Fun-Fi! I also had to stuff the biggest coupling capacitor I could in there.
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Possibly OC3.
At closer look, the purple is on the outside glass, but the inside glow is closer to amber (?) than to purple.
So many different type gas regulator tubes; so few amplifiers and so little time.
OC3 also seems to be the perfect regulator for the 717A pentode.
I have a pair of those 717A pentodes.
At closer look, the purple is on the outside glass, but the inside glow is closer to amber (?) than to purple.
So many different type gas regulator tubes; so few amplifiers and so little time.
OC3 also seems to be the perfect regulator for the 717A pentode.
I have a pair of those 717A pentodes.
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