Yes, relatively low power, directly heated triodes. Very linear devices.
Many folks believe the 2A3, 45 and PX4 to be the best power tubes made.
Many folks believe the 2A3, 45 and PX4 to be the best power tubes made.
here in Germany a great amount of music lowers believe, that the 300B sound would be the best. I have heard the Tambour 300B (SE) against the diy Zen-Version - pictures in the attachement and regarded the ZEN about
http://www.diyaudio.com/forums/pass...itional-op-amp-ultimate-sounding-phl1230.html
I have heard by direct comparison approximately 10 years ago. At this time the now integrated active tweeter crossover wasn't include.
The showed Zen version above mentioned thread outperform the Tambour 300B monos in all respects (the speaker from this time was PHL B17-1230 and Focal T120K). After finished the Zen in this first edition were sold 300B monos from the owner (please note - sound of 300B is not really bad, but less realistic (could be advantage by certainly recording techniques in some cases).
I think, also the diy devices from this project here must be outperform each tube amp, no matter, what type of triode are inside. Otherwise there are fatal errors or it was in the components due to high cost saving too much (or both).
http://www.diyaudio.com/forums/pass...itional-op-amp-ultimate-sounding-phl1230.html
I have heard by direct comparison approximately 10 years ago. At this time the now integrated active tweeter crossover wasn't include.
The showed Zen version above mentioned thread outperform the Tambour 300B monos in all respects (the speaker from this time was PHL B17-1230 and Focal T120K). After finished the Zen in this first edition were sold 300B monos from the owner (please note - sound of 300B is not really bad, but less realistic (could be advantage by certainly recording techniques in some cases).
I think, also the diy devices from this project here must be outperform each tube amp, no matter, what type of triode are inside. Otherwise there are fatal errors or it was in the components due to high cost saving too much (or both).
Attachments
Last edited:
It is my humble opinion that you can build a very good amplifier
out of 300B's, but there are not that many out there.
😎
out of 300B's, but there are not that many out there.
😎
naah ...... it will be balanced small signal Jfet input stage ditto in cascaded xformer output ;
PSU will be shunt type
Member
Joined 2009
Paid Member
I doubt it will be Class D, Nelson likes to build things with parts he can see - and who can argue with that ?
I forecast it will be something simple in schematic and fit for DIY but very complex and subtle in how it achieves it's outstanding performance. It will be based on power devices with outstanding properties which are most likely not available to us today.
I forecast it will be something simple in schematic and fit for DIY but very complex and subtle in how it achieves it's outstanding performance. It will be based on power devices with outstanding properties which are most likely not available to us today.
Imagemagic is great. I used to love xv. i wrote an explicit optimization function in one of Sun's compilers for it (think it was 96 or so). Great little program, cool to see it still being around.
i'm more into gimp these days and paint.net for creating original content).
sorry for the thread hijack -just a trip down the memory lane...
Show us how it's done
Well Nelson
So how would you build a better sounding 300B amp?
Ejam
Well Nelson
So how would you build a better sounding 300B amp?
Ejam
This OPT that you used will increase the voltage gain about 7~8dB.
So it will be louder.
But what is the maximum primary DC bias current of this OPT?
Last edited:
Chances are likely that iPapa will be entertaining himself with a monaural setup in 20 years and 2 months from now, using a single light bulb, fully biased of course.
BTW, my absence of 300B for comparison was intentional, I've heard many, and don't care for that tube. Could it be the circuit implementation, sure.
The transformer will sure do a much better job at blocking ps ripple and it will allow the rail voltage to swing higher.
Leve
I've been simming an interstage coupling transformer in an upcoming differential amp project and notice that I can get gain from the transformer. I don't know how that will sound, but I'm sure going to find out.
Hi Wensan Ya,
How are you?
the OPT is at about 1.5A, so it is somewhat saturated ay low frequency.
Kenchen said he will build larger OPTs for me.
cheers
Coffin
After picking up Janneman's OPT Nemesis project with Electra
Print, we have a nice transformer that you can bias between
1 and 1.3 A, with a 64 ohm primary and an 8 ohm secondary.
This will be featured in a project to be published in Jan's new
magazine I think in June, and I believe that Jack at Electra
Print will be offering it at a reasonable price.
😎
Print, we have a nice transformer that you can bias between
1 and 1.3 A, with a 64 ohm primary and an 8 ohm secondary.
This will be featured in a project to be published in Jan's new
magazine I think in June, and I believe that Jack at Electra
Print will be offering it at a reasonable price.
😎
Pimm Solid State amp with transformer stages
Here is Gary Pimm's old SS amp with transformer stages. The interstage tranny is made by Bud Purvine of Onetics.
http://www.pimmlabs.com/web/solid_state.htm
Here is Gary Pimm's old SS amp with transformer stages. The interstage tranny is made by Bud Purvine of Onetics.
http://www.pimmlabs.com/web/solid_state.htm
Hi, Coffin,
How are you?
I'm still receiving the unemployment benefit now.
It seems like I live in retirement for a year in advance.
My family have a good time in this period.
The 48Ω:8Ω OPT has a voltage ratio about 2.4:1 .
Do you figure out why the voltage gain of the amplifier doesn't reduce but increase?
Wensan
Last edited:
Hi, Coffin,
I notice that if the output of the Single-End OPT is open,
The Single-End OPT just like a huge inductor.
The counter-electromotive force may damage the transistor.
Do you add any protection to protect the transistor?
Wensan
Last edited:
Hi
The voltage gain does decrease when I compared the output signal and signal present at drain. About 2.5/1.
Gee....I'm unemployed now. At least glad to hear you had a good time with your family.
cheers
Coffin