Intact Audio

as dave is in DC at Capital Audio Fest, I will just give my opinion... *my opinion*...... I have not had an issue with a nominal 16V into his autoformers... very few genres have output at full level down to 20Hz.... and as you go up in frequency, the headroom of the iron grows at an exponential rate...

super duper great to hear that things went well! I missed out on thai food (my favorite) and endless tube geek discussions (also my favorite).... instead, dave made me go to an audio show... which, although I got to see many friends, was not nearly as much fun as Thailand would have been.. bad sound...

hey chris.. as you can guess form the lack of reples, this one is tough to dignos without knowledge of teh circuit... teh difference is in teh preamp.. the amplifier is getting teh same voltage to the first tube in both cases... well, the source impedance seen by the first tube changes, but that usu...

YEAH!!! Welcome Stephie!!!

I am looking forward to more tube madness...

woo hoo!!!!

Peace,
Jeffrey

hey Jimmy... the project goals developed when you were likely buried in the school books.. the sound of A1... so biased in A1... voltage *well* below 1kV... need a little power, so good behavior into A2... sort of like randy's 'il monstro... and I think you and I can both agree that straight A2 soun...

hey guys.... I just feel obligated to say that although I like those tubes, a 1:1 and any A2 is pretty much out of the question... maybe three stage... 826 > 46 > gm70.... but, as Jim says, with my horns, a 46 > GM70 with a 71A linestage is plenty of gain.. and, yes, I realize that is unusual.. :^O ...

hey fellas.. we were talking about a bifilar 1:1 for a 46 driving a GM70... not sure which I would like better in this application... the GM70 has pretty good tone... so then I guess I would just choose the one I think just makes more music.. and, to me, that is the 46... but I know more than a few ...

DOH! yeah... I forgot about the bifilar voltage issue... I have an arrangement with dave.. if I break, burn, explode anything, it is my fault.. and I have to report the fault conditions.. I guess I am more of a beta tester on some things... still.. I'd aim for 350V and a 3c24... then make him be rea...

well... first build the filament supply... a variac will help here.. build for 6V and variac down...

then build a high voltage supply... again use a variac...

clip leads and a stack of cathode resistors will get you where you want to be...

clear as mud?

Me

fighting for art....

dave wound it.. I built it... I ended up using the Eimac 15e to drive the 304tl... the driver stage was amazing.. super clean... I am actually rebuilding the power supply side of the 15E breadboard so that I can try the 15E in my phono stage... in the end, the combo of Eimac output and driver was a ...

Hello, Simon... yes, I suspect you can do this... I have used dave's autoformer for gain many times... just reverse the input and output... the catch is that you have to have a low source impedance as you will lose inductance/bass.... but that is exactly what you want! so... here's what I would do.....

dude.... nickel filament chokes... I am jealous... time to buy a foot of nickel and rig up my drill.... super, duper jealous...

and I won't even speak to the artistic photos... see my website for how unqualified I am to even bring up the topic...

Me

yummy...

I wanna see the KEPCO! I wanna see the old industrial guts!

Me

maybe a 6AS7 in front of the autoformer will be a good low gain buffer?... else a low mu DHT like I use?

Peace,
Me

I know... confusing... I have built several LCR riaa's so far.. but only one with dave's iron... but it is my favorite... :D I wish I could tell you the perfect answer.. I am afraid I can't... driving 10k through a bifilar 1:1 with a dcr of maybe 700 ohms each side worked wonderfully... 6c45 with ba...

Greetings Nick, Dave... sounds like the beginnings of a great setup... so where do I have to vacation to to hear it? :) but that is a lot of thoriated sound.... I think you may want something a bit more full-bodied than a 71A... it is beautiful for sure, but not particularly meaty... I think a 45 wo...

brother steve of the vacuum... I have a question for you... I have this amplifier that is pretty normal push pull triodes... well, normal for a single ended guy... and I was wanting to experiment with feedback to lower the output impedance... now, I am a *total* rookie at feedback.. well, unless you...

I talked to jimmy on the phone about this one... so, just to make sure we were crazy, I had him measure grid to ground on the 71a.. we measured open circuit... even with the volume (tvc) on the first "click"... but he has measured the bias of the tube and all was fine.. it makes music.. so...

hello guys... I love Jeff's comment about buying it for tweaking, but it has become permanent... that is *exactly* my situation... can't let it go... crossovers belong in front of the amps... every time I do this I am amazed.. but the digital input? how can that be terrible?!?!.... all they have to ...

I completely agree that tapping would be great... with these you really need lots of thought on gain structure to keep the digital sugnal up... it took me a while to get mine just right... but with the tapped tranformers, it is easy.. and, yeah, once you get rid of the output stage, they sound good....

hello fellas... just trying to document the current status of Steve's amps... the great thing about Dave's forum being set up this way is that we can easily search and have thoughts and findings easily accessible... so Steve's amps went back home and dropped one resistor connection in transit... Gra...

something crazy going on with the planets... maybe the moon.. I am breadboarding a PP amp and Douglas is building a Sakuma style DHT SE amp... whoah..... Steve Schell's everyday listener is a 45>45 amp... you should ask him about it.... he uses a 26 up front instead of a step-up, but it is all IT co...

hello again, Mark.... well, from the specs, it looks like an A2 tube... but it doesn't have to be... I just finished up Steve's amp.. it is running just a bit over 500V and gets little more than a watt out.. A1.... but that is all the power he needs and it certainly sounds very sweet on his speakers...

with the risk of making it even harder to get the next pair on eBay, I will say that the 75tl is my absolute favorite tube at the moment.... I normally just say "top five" or some such thing, but it is pushing all my buttoms at the moment.... but it isn't easy to get five watts from 10Hz t...

gotta love you, man... how can I turn that down?... I know the wings are pretty, but you might keep me from mono.... ahhh... listened to your amp thursday night and friday night... and saturday.... time to get them packed up... my GE caps sounded kinda dull.. they were new manufacture... big cans, b...

I listened to Steve's amps with a few different cap combinations yesterday.. I eventually settled on a tin foil cap (mundorf) across the RS241 power supply and a silver foil and oil (mundorf) across the 75tl... too much oil and it gets opaque... I personally tend to like the Mundorf Supreme (tin foi...

ok... so here's what I learned today... well, let's hope I learned more than this, but this is what I learned about Steve's amp today... I listened to mine... it was hooked up.. then his.. chose some acoustic music... bluegrass, actually... so that I would focus on the mids and up.. mandolin, fiddle...

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identified by sight... agreed, Dave?