It *must* use a bridged output chip, and as was hinted, *very* probably a Class D type.No way you can pull 5 *audio* watts out of a 9V 600mA PSU.Price is madness, but they may sell a few based on their novelty value.Mind you, being a recording you have no idea of actual loudness; anyway they *only* plug it into very loud boxes: a regular Marshall 4 x 12" or boutique 2x12" with Vintage 30 clone ... and the drummer stays 10 feet further than the amp.Anyway, nice idea and the sound is good.Probably some *good* distortion pedal into a chipamp.
So who's going to buy one to pull to pieces
Gents,James from Diago here. I've been a member of the forum since early 2009, and a lurker for a lot longer than that. Teemu's book is amazing. I've learned a lot.In response to your questions:1) For the power amp, we're using a TDA7240A in bridged mode. Into an 8 ohm load, we can get about 5W out of it; nearly 7W into 4 ohms (not clean).2) For the best recording, see here: http://www.youtube.com/watch?v=Cablnl3Ag7Q Do you really think that it's no better sounding than an LM386 based circuit? That doesn't seem to be the opinion of most people who have heard it or played it. I've built a bunch of solid state pre-amps and amps over the years and making a great one takes a great deal of hard work. I'm really surprised you're comparing the LS with the LM386 based amps.3) Pricing is a function of manufacturing cost, reasonable profit and the long distribution chain in this industry. In the UK they retail at £99, including a power supply, which is much less than a lot of much simpler and less costly distortion pedals, without a power supply. Do you think that it's wholly unreasonable compared with anything else? If so, what do you think would be a reasonable price?4) It's entirely analogue using a bunch of carefully designed op-amp gain/filter stages - think Sansamp approach with some more work. Yes, it's almost all SMD.5) Absolutely, it sounds the best through some decent speakers, and a decent cab. Don't all amps? That's one of the premises - most smaller amps are coupled with cheap crappy speakers, and people wonder why they don't sound so great...6) The EQ controls are +15/-30dB. On higher gain settings, they don't do as much, since a lot of the distortion is post EQ.7) The gain pot is as I designed it. It's voiced to give a plexi vibe, and with single coils it cleans up reasonably well. Yes, with higher output pickups it's very easy to overdrive, just as intended. I appreciate your criticisms, but it isn't designed to be the world's most versatile amp. That's not what most people want.If you absolutely must clone it, then I respect your freedom to do that. However, Diago is a tiny company (just 3 of us), and I'd like to think that you may consider our business and livelihoods in the process. I don't know what effect having that info in the public domain will do, but I ask that you consider the possible effects on us. I appreciate that doing it has negligible effect on the larger organisations.I'm happy to answer as many questions as you like. Fire away../If some of the more experienced of you have any advice, I'm happy to listen/read. James @ Diago.
Hi James/Diago.Congratulations on designing and building a *very* good sounding product.In my book, that's the main point.The fact that the physical design is cool , only adds to its desirability.The Ferrari Red paint definitely does not hurt. So you got to sell it at major Music Shops, both in USA and the UK?(Not forgetting other Countries) Incredible !!I fully agree that the Distribution chain is long, has way too many parasitic stages, and all of them multiply price by a lot. Unfair.Speaking for myself, please take my comments with a grain of salt and consider them made in good faith.Not knowing *anything* about your amp or background, all we can do is guess.Thanks again for being so polite and using some of your valuable time for writing us.Congratulations again on a great sounding (and looking) product.PS: *if* you could enlighten us on anything you think useful or interesting, such as your approach to manufacturing, or some short explanation on distribution channels or whatever, we would be very grateful.It's a kind of experience far removed from our daily one.PS2: and please tell me that the 600mA rating from the PSU is *very* conservative.I do not doubt your power rating, the datasheet also confirms it, but I'm calculating a higher current need.Not a criticism, quite the contrary, maybe your PSU is *way* overbuilt . Good luck.
Joe, Juan, everyone else,....Keep firing questions at me if you have them. James @ Diago.
As we're both engineers...