[Parafeed]

Quote:

Originally Posted by swedishhatfaction /img/forum/go_quote.gif That is most excellent! Does she have a name?

Quote:

Originally Posted by apatN /img/forum/go_quote.gif Wow, that's a beauty Parafeed!

Thanks. If it had a name, it'd be a pun on "pain"! Something to do with pain anyway, on account of the fact it took a year and the expiry of one of my last stashed pair of 3A/167M's to come up with a 6C45 design that was at least as good as, or better than the amp it replaced - basically the Gary Dahl Espressivo design on steroids - series and shunt regulated (each channel) after the choke input power supply, and using a choke load rather than the hybrid Pimm pentode CCS load.

I could waffle on about how the Miller capacitance seems to affect the 6C45 SQ (bandwidth) more so than with the WE437A and STC 3A/167M, even using a low value input pot. (So drive it from the cathode and ground the grid.) Or how they love to oscillate given half a chance. (Never believe anyone who tells you that the 6C45 sounds solid-state or has "glare" unless you've 'scoped it in the circuit! Stopper resistors are not a luxury, they are a necessity!

)

Anyway, it's a very good sounding amp and I've built two more based on the design for other people. One, same as pictured, no expense spared with the BG WKz, (every other cap is poly), MQ (Peerless) TL-404 autoformers and the other, a budget version (relatively speaking), using Sowter 8665's at the output transformers, dropping the shunt regulators and skimping on the parts quality a little. But to be honest, SQ wise it didn't make a lot of difference.

 

[Llama16]

Parafeed, that is one hell of a gorgeous amp.
I just fell in love with the way the headphone jack is placed vertically, gives it such a nice look.

 

[sachu]

Just got done with this...as much as i would love to sit here and listen to it all night i got o head ff for a dinner of sorts

For your viewing pleasure, my reference amplifier, The Cavalli Audio Stacker 2. Still got one bit left to do..the heater switch wiring.

 

[MrSlim]

OK Sachu, fess up, how did you get a Stacker 2? Is someone doing boards for it?

And the big question, has it supplanted the EHHA as your Fav?

 

[Spasticteapot]

I've been thinking of making up a batch of enclosures to sell for money (I'm broke, I'm in college, and I have arthritis - as such, I have to get creative.) The format is pretty simple - I'm taking sections of 12" x 8" structural steel square tube and plating them with nickel, then putting a piece of mesh, sheet metal, or exotic wood on the top and bottom. The tube has 1" roundovers on the corners and 3/16" thick walls (overkill much?), and after nickel plating it I could either polish it, copper plate it and apply an antique patina or a polished finish, or give it a nice coat of paint. Prices would start at $100 for a basic model to over $200 with a polished finish, hidden screws, predrilled holes, and a top piece with an exotic wood veneer. I'm also looking into making custom knobs by electroforming (a process by which a thick layer of metal - in this case, copper - is plated over a nonmetallic object.)

Two questions, though:
1. Will people buy these?
2. Considering that these are 8" x 12", how tall should they be? I was thinking about 5" - not only is this just high enough for most EI transformers and tubes, but it also leaves the small ends with a width to height ratio of 1.6 - "The golden ratio."

 

[johnwmclean]

Spasticteapot, The chassis market for DIY at the moment is a pita, done right you’d make a killing. I think your on the right track, but you’ve really limited yourself to one size, imo you need to cover a far few sizes to attract a wider audience.

BTW this not the right thread to discuss your topic, I suggest you seek a Mods advice as well.

 

[Nebby]

Not quite an amp, but it's definitely DIY!

 

[cyberspyder]

Nice ZBM4's!

 

[mattcalf]

Awesome work Nebby, love DIY speakers. Can't wait to get mine finished.

 

[cetoole]

 

[krmathis]

Quote:

Originally Posted by Nebby /img/forum/go_quote.gif Not quite an amp, but it's definitely DIY! http://farm3.static.flickr.com/2623/...fab0548e93.jpg http://farm3.static.flickr.com/2681/...1327854994.jpg http://farm3.static.flickr.com/2802/...4922705aba.jpg

Niiice!

 

[FallenAngel]

Oooh

 

[manaox2]

Those speakers are awesome Nebby, congrats.

 

[regal]

Cetool, incredible! Where in the heck did you find a PMD200 ?

Edit, I guess that is a 100, looks different than most I've seen, what are the DAC chips ?

 

[cetoole]

That is a PMD100-4x PCM1702. PMD200 is in a completely different package, and believe me, it is hard to find. I have been looking, and the only ones I saw were on some chinese auction site. I didnt think of this, but it is difficult to make out. That is an Adcom GCD-750 I modded, new analog power transformer, rectifier diodes (wanted lower dropout of schottky), replaced all of the ~15 year old 'lytic caps, and discrete I/V.