Originally Posted by bigmac
hey so I'm pretty keen to attempt this just for fun, BUT i have a few questions..
I know the answers are probably in this thread but its 400 pages long and I dont know where to start looking for them searching turns up hundreds of results and none of em really tell me what I want to know..
1. Is this build still worth it? 400 pages of replys must be pretty popular right but its also 4 years old has it been supersceeded?
2. how does it compare with say the project horizon? or also a manufacturer amp. eg. fiio e17?
3. the guide / parts list on the pmillet page, is it still valid? or is there an updated version I should look at? other than changing the tubes to 12au7's (seems to be the go)
4. How hard is it? I did electronics in year 11/12 and 2 1st year university electrical engineering subjects so I do have an idea. Im confident I can wire it up probably point to point with a negative rail on the side or something. but theres alot of talk about things i have no understanding of ( i never learnt about amplification), is understanding optional and just being able to wire it correctly would be enough?
5. seriously can someone just give me a link to a powersupply i should buy? I'm really lost when it comes to this and dont know what to look for (been reading kimlaroux's posts but i think im more confused now than before)
6. I live in australia, where do i buy these parts?..
I really think building this would be fun mostly and maby one day drive something worthwhile one day..
Thanks so much for anyone who answers! :)
ps: I understand that the only answer might be that if have this many questions maby you shouldnt be trying this...
in the meantime im going to continue serching and reading
1. The principles will remain valid for as long as there are tubes, I suspect. The problem is that the original 19J6 tubes have disappeared from the face of the earth in any kind of quantity to support someone making kits or PCB's and selling them to the masses.
2. I may get accused of bias, for sure, but in my experience, dual triodes are somewhat of a problem when using a single tube (just 1) for both left and right channels. The principle of the SSMH and many other tube amps - that use dual triode tubes - tie the triodes together so that you have one tube per channel, regardless of whether the tubes inherently possess two separate circuits or not. Without going into a lengthy discussion that comes from testing literally hundreds of dual-triode tubes, IMHO, it's better if the tubes are used one-per-channel, period.
3. Yes, Pete Millett's schematic is still valid - for 19J6 tubes. However, during the course of the SSMH, Dsavitsk designed a PCB with some improvements. Those improvements seemed to work even with the point-to-point versions as well. As you mention, however, the 12AU7 seems to be the way to go with the scarcity of the 19J6 tubes. The newer version with all the tweaks is documented on the SSMH website here:
4. That's a highly subjective question. Bottom line, if you can/have built a CMoy, you are probably capable of building a SSMH.
5. The 48V Cisco power supply is still valid, but you need to be careful with the DACs you may plug into it. The Cisco power supply will fry some DACs that have little output protection, such as the Gamma 1, AlienDAC, BantamDAC or similar. The Cisco Supply is specified in the BOM here:
Edited by tomb - 9/7/12 at 9:54pm