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In Reply to: RE: charles, what speakers do you use with your Frank-IIs? (NT) posted by charles1dad on March 25, 2014 at 13:53:20
Um... Maybe I should have put it like this: it is relatively not difficult to diy an 300b SET amplifier which can be on par with any commercial amplifier available outthere. And once got to this level having accumulated just enough technical background and diy skills, a new horizon of options and opportunities open up to the builder to take the sound of his system to a completely new level that is tailored made to the builder's own taste and that is very difficult to achieve with the commercial gears.Of course Im not good at this. Thats why Im still reading those guys over the diy forum, learn and try a thing or two at a time. Some of these people are really as advanced as any gurus in the industry like the gentlemen you named.
Never meant this to be a my amp is better than your thingy. I heard the mono blocks in discussion here. I stated that they were very good and were very reasonably priced. But they can definitely be improved upon. Ideas can be found all over the other forums. Do the manufacturer knows these, of course they know but they have got to make product that sells. The amps you have must be one of the better efforts from the manufacturing and marketing perspectives.
In fact the amps Im listenning to at home are somewhat similar to yours in that they are mono block utilising an interstage transformer to couple the driver valve to the output. However, there is only 2 amplifying stages, a triode wired pentode valve and the 300b (more to do with taste rather than being technically superior to your 3-stage all triode amp). The power supply is hugely over-spe'd, choke input LCLC filter for HV supply, separate filament transformers for 300b filament feeding a choke input LCL filament supply. The Interstage transformers and OPT are some of the best that I could lay my hands on. The other boutique parts like capacitors, resistors and silver wiring I also use but they are just icing on the cake and wont impact sound significantly.
Recently Im experimenting with different bias arrangement, and beginning to understand the importance of good layout and wiring and how the circuits interact. Im gonna make new chasis and build my linestage and amplifier from scratch again. I know a lot of people are more or less on the same journey. It has been alot of fun.
I say all this is because when I see people raving about their gears using audio magazine invented terms and expressions, i just feel the urge to make a sound that there are different options out there and relying on certain manufacturers to make certain choices for you may not be the best choice in this hobby. A few years ago I thought about my Audio Note amplifers the same like you think right now. Still with due respect to the said brand, I think very differently these days, I no longer slave my needs to certain commercial brands, products amd reviewer's opinion. And to me I enjoy this hobby much more because of that.
Cheers.
Edits: 03/25/14Follow Ups:
Hi,
You speak to the heart of the matter. This IS a DIY audio forum. It IS possible, and really a lot of fun, for DIYers to make really good amps !! Like you, I am a NON EE type of guy.
My take on a 300B amp was to use a AVVT 32B and do a two stage ( of course!!) with a 12BZ7 direct coupled into the Finals, and it had a LOW DCR modern supply, all iron under 10 Ohms, including the custom power transformer.
The amp unfortunately did NOT power my intended load ( FMI 80s ) so I sold the AVVT 32Bs and converted the amps to 2A3s, used higher efficiency speakers.
I enjoyed your posts sir !!
Jeff Medwin
Vincin,
You're obviously very proud of and pleased with your amplifier and that's sincerely a good outcome. I agree there's no reason to make this a my amp vs your amp issue, that is a waste of time. Yep, I'm quite happy with my amplifier and if there are some other SET amps that are better, then that's more good news. I'm not sure what is meant by "invented terms". In audio the vernacular by nature is descriptive and expressive and most folks will understand the attempted communication. It's fair to say our respective amplifiers are serving us very well. As for me that's the desired goal. I've come accept that no matter what you own someone is out there to say what they have is
even better and so it goes. I imagine that your amplifier sounds wonderful.
Regards,
Charles,
Edits: 03/25/14 03/25/14
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