Crack;Bottlehead OTL
Feb 22, 2021 at 9:54 PM Post #10,696 of 11,049

cddc

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Folks, stay away from this idiot, wege_high_tube, aka "the Italian BangyBang". He is a sheer liar/scammer, look what he is doing - selling a pair of fake GEC 6AS7G for $450, it's actually a pair of Russian Winged-C rebranded as Haltron, worth $20 at most.

https://www.ebay.com/itm/6AS7G-TUBE...LIFIER-A1834-6080-VINTAGE-STEREO/254195578638

s-l1600.jpg
 
Feb 22, 2021 at 10:19 PM Post #10,697 of 11,049

jonathan c

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Feb 24, 2021 at 3:23 PM Post #10,698 of 11,049

DeweyCH

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Crack is in the house. Time to build!
 
Feb 27, 2021 at 1:45 PM Post #10,700 of 11,049

DeweyCH

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Get cracking! Keep posting!
Paint and stain drying. Went with a satin nickel for the top plate and bell and some Minwax Provincal for the case. I’ll pop pics up when they’re dry.
 
Feb 28, 2021 at 9:02 PM Post #10,703 of 11,049

cddc

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Would this amp work with audeze Lcd4z? Idk how to read how combo of amps/cans work.

As @DenverW answered, Crack or other OTL amps won't work well with low impedance headphones like LCD's.

You should consider Bottlehead S.E.X. or Bottlehead Mainline amp instead, which work for both high impedance and low impedance headphones.
 
Feb 28, 2021 at 9:30 PM Post #10,704 of 11,049

DenverW

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As @DenverW answered, Crack or other OTL amps won't work well with low impedance headphones like LCD's.

You should consider Bottlehead S.E.X. or Bottlehead Mainline amp instead, which work for both high impedance and low impedance headphones.

I will hopefully be trying the s.e.x. Kit soon, but I find the mainline kinda meh with some Planar. Quad era 1 and lcd2c were good, but hifiman He-500 was meh.
 
Feb 28, 2021 at 9:31 PM Post #10,705 of 11,049

cddc

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Tubes in general are high output impedance devices, with no output transformer (i.e. OTL or Output TransformerLess), they normally work well only with high impedance headphones. Low impedance headphones normally need output transformer to match impedance with tubes.

But output transformer has 2 major problems: 1) dramatically increases the amp cost, a high quality output transformer like Audio Note or Lundahl can cost a lot of $$$ :dt880smile:; 2) output transformer will alter the amp sound, you are no longer hearing the pure tube sound from OTL amps, instead the sound is now somewhat shaped by output transformers, which is really bad IMHO, we can't roll output transformers after all, right? :beyersmile: But in case of 300B or 2A3 amps, you'll have to use output transformers :angry:
 
Feb 28, 2021 at 11:12 PM Post #10,707 of 11,049

jonathan c

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Tubes in general are high output impedance devices, with no output transformer (i.e. OTL or Output TransformerLess), they normally work well only with high impedance headphones. Low impedance headphones normally need output transformer to match impedance with tubes.

But output transformer has 2 major problems: 1) dramatically increases the amp cost, a high quality output transformer like Audio Note or Lundahl can cost a lot of $$$ :dt880smile:; 2) output transformer will alter the amp sound, you are no longer hearing the pure tube sound from OTL amps, instead the sound is now somewhat shaped by output transformers, which is really bad IMHO, we can't roll output transformers after all, right? :beyersmile: But in case of 300B or 2A3 amps, you'll have to use output transformers :angry:
Is it time to invent a transformer adapter?...
 
Mar 1, 2021 at 4:17 PM Post #10,709 of 11,049

DeweyCH

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IMG_0885.jpg


It's begun (no the staining process isn't finished yet, yes I'll be adding a clear-coat when it's done with stain, yes I probably need to do another coat on the top plate b/c my wife dropped it while it was drying)
 

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