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In Reply to: RE: TV-damper vs. 274B posted by Xover_Network on February 29, 2012 at 17:31:28
The "best" sound in a rectifier would be a Cree Schottky or something in Mercury Vapor. Use what you think is cool and fits with the design of the amp. Dampers are cool because you need more of them. Chinese 274B looks cool because it is nostalgic.
I would not sweat it, you ain't gonna win any absolute best amp in the world awards with PP EL34 even with real NOS Western Electric 274A engraved base rectifiers. It doesn't work that way.
There is no "best" topology or tube type. SE vs. PP. DHT vs. IDHT. Triode vs. Pentode. These contests are audio forum debate issues, not real-world issues, because there isn't any one best approach. It all depends on the execution and the application. Any combination is capable of top-flight sound quality when properly designed and built, and then paired with a compatible speaker. In my case, my favorite sounding amps are PP KT-77 monoblocks. My 46 SE monoblocks also sound great but they run into power limitations on some types of music even with my 99db speakers.
Sounds great and this is exactly what i meant.
An EL34 push pull amp called Virtual Image 24 Stereobloc used to consider one of the best sounding amp by all reviewer. And it's a conventioanl EL34 type amp in triode class A with output tranformer look like a Dynaco ST-70 OPT (A470)!! THis amp runs in triode mode, and my friend has one and it is capable 18W in triode class A, and put side by side comparison in 2004 against several reference amplifiers I have on hand:
- Fisher 50AZ (with KT90 triode) -- loan from my friend
- Lynn Olson Karna
- Lynn Olson Amity
- 300BXLS with parallel feed output stage
- Audion PX25 SE amp
- Welborne 45 DRD
The Virtual Image sounds really great even up against my reference amps, This is pretty solid in performance!!
I love high power, this is the reason I have my McIntosh MC3500 driving my JBL DD66000 with subwoofer! But I won't put 20 Watter Lynn Olson Karna or my all time favour 300BXLS amp on the JBL. I like the 45 on Hedlund horn system, I won't put a high power like Manley Ichiban amp or ASL Hurricane MKII or Big MAC on Hedlund horn.
I love Quad II amp on ESL57, but I love Electrocomapniet Otala Class A solid state amplifier on Stacked Quad ESL57 since no tube amplifier can handle the impedance from the stacked action......This is lots of example for having good sound through different (careful) matching and interfacing.
The theory also apply well in building amp.
Around 2 months ago, my friend who located in Asian now has asked me a question about building a big triode SE amp since the tube he can get is in graphite plate, not copper plate constructed. Actually I work on the same type of amp, and I just received a circuit from him and looks like this is derived from "Power Drive" circuit.
Let's back to the business, he was asking my comment, I told him less effort for part selection if metal plate tube is available. Since you deal with graphite plate, it will take you more time and effort to play with different parts and tune the circuit.
I've built amp with Valve Art 300B with graphite plate or other tube type with graphite, it's a nightmare, not bad sounding. But It takes me tremendous amount of time and energy for "parts selection" to achieve optimal result!!
Please post me on another matter.
I really like your writing, lots of experience...cool!
anyway could you please explain more about troubled graphite plate?
.......the best sounding amp should be 2A3 SE not PP type if 2A3 is the choice. Why 2A3 in PP? It doesn't have much power in PP. Anything under 10W, we can go for SE type with low power tube if crossover distortion is concerned, that's why low powered SE is getting popular since early 90s!! I love the sound of 45SE with Hedlund horn, well....2A3...sounds good but not my cup of tea, both PX25 and 45 are my favorite!!
They all different between DHT and pentode, EL34 in triode is completely different animal. It has nothing called "best or worst" in audio, just a matter of taste. I have big reference system, also horn type and panel, electrostatics, even hybrid, the more I own, the more I know they all have its own limitation. Unlike yesteryear, I respect all designs today. I hated SS one time even I hated the ss amp used to own in my reference system for couple year. Then I gave up and go for tube gear for many years..... and told everyone sands amp no good!!
Until one day I hoop up to proper speaker with those SS, WOW!! this is incredible....... Then I understand, no tube amp can able to drive a speaker seek for current, like Shahinian, Dynaudio...etc.
Are you listening to all different combo under the sun? I guess not, me either. I have many loudspeakers at home, a truly big reference system to Quad electrostatic, and even bookshelf type. I truly respect to all type of design today
I like transistor amplifier but tube SE or PP type as well. Depends on what speaker you hook it up.....lots of factor affect the sound. I doubt it 2A3 PP has the power like the well made EL34PP, the midrange characteristics are totally different. The 2A3 PP might work on your speaker, however, do you own the speaker that another fellow going to have the EL34 in triode and sounding really great??
I agree with U Schottky diode it good, and Mercury is good, 274B also good, they all good, depends on what circuit of tube type you work on. My friend and I work on a tube amp that constructed with graphite plate, then the chosen cap, rectifier and parts selection is totally different than the one made of metal/ nickel plate...Synergy is the right answer to audio. It's ALL DEPENDS!!
I won't compare a ML against a Bedini or ARC vs Jadis. It's matter of taste. Some even says Sakuma design had no bandwidth are sucks, however, if listen to multi e-xover system with Sakuma stuffs, this is different type of audio experience.
My point is not against PP in triode!! "FOR UNDER 10W AND CROSSOVER DISTORTION IS UNDER CONSIDERATION", then one single SE tube is more adequate.
Also, I don't understand why people building a PP amp under 10W if proper design PX25 and 300B can have almost or more equivalent power in SE!!
Back in Y2K, my reference PP amp is Lynn OLson Amity (earliest version) and my favourite amp is Fisher 55A (6550 in triode), and this is the reason called PPT as moniker! I never bothered a 2A3 or 45 in PP!!! Not make sense to me and not the type of sound I like.
45 in PP less power than a PX25SE
2A3 in PP less power than a 300B
They all under 10W and crossover distortion is sensitive in this power range, SE amp is more adequate. A proper SE design will blew away all PP under this power range ( <10W)
All my "push pull triode" above 20W! Alright!!
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