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A Very Compact Hybrid Amp - Page 107

post #1591 of 2213
Quote:
Originally Posted by keyid View Post
As runeight says, some tubes flash brightly when they turn on.
The bright flash is standard procedure for some tubes. I have no idea why.
post #1592 of 2213
Mine does that flash too
post #1593 of 2213
Quote:
Originally Posted by cfcubed View Post
BTW, I think when I noticed this < 1 sec of brightness at power on for some tubes I found it was the LED below the tube, not the filament itself.
No in this case it's the heater connected to pin 4.
Thank you all!
btw:all this wiring and screening C4's wires took most of the time, but I think it looks beautiful and I've no problems with hum, or noise (yet, haven't tried 6H6Pi)
post #1594 of 2213
The flash is from a small bit of thin filament with a low resistance when cold, when heater voltage is applied a large inrush current goes through, the small filament heats up quickly (flashes), increasing in resistance which then allowing the main heater to warm up with the current stabilising.
post #1595 of 2213
I haven't kept up with the CTH thread for a long time, but are the full kits with custom panels available now???

Uni holidays, so I'm itching to build something
post #1596 of 2213
Sure, see here:
CTH
post #1597 of 2213
And I take it the tube holes are drilled as well???

I suck at caseworking, so yeah...
post #1598 of 2213
yes, it's optional (upgrade).
post #1599 of 2213
nsx_23, it does seem like you are missing a tube amp in your stable!
post #1600 of 2213
3 brand spanking new CTHs tested and ready










They all feature Janzten audio 0.22uF crosscaps for the coupling caps.
The middle one in the long case has preouts and a shunted ALPS RK27, while the leftmost small one has a mini out which is switched by the neutrik1/4 inch jack.

The 4th one needs an inductor and the 5th one (mine) needs a splitter section transplant.
post #1601 of 2213
Quote:
Originally Posted by sachu View Post
3 brand spanking new CTHs tested and ready to be shipped to their new owners..

They all feature Janzten audio 0.22uF crosscaps for the coupling caps.

Very nice. How do the Jantzen crosscaps compare to other coupling caps you have tried?
post #1602 of 2213
that's alot of builds. are you selling them? just curious as to why you build so many.
post #1603 of 2213
Sachu is the number one builder of CTHs, now beating out NUX, who was off to an early lead!
post #1604 of 2213
Quote:
Originally Posted by holland View Post
that's alot of builds. are you selling them? just curious as to why you build so many.
They were built for friends..a couple of them are for HFers. Only charged them parts cost. Kabeer and Andrew_H are among them. I just couldn't let Kabeer run the Yamaha YH-1000 with a mini3.
Andrew_H, manager of Maximo Products has been a steady supporter and sponsor of our local Portland HF meet chapters.
So when he asked me if I could build him one at Canjam last month, I couldn't turn him down.
post #1605 of 2213
That's cool. It sounds like you've got quite a crew there.

I also noticed you seem to be moving into the esoteric headphone area. Aren't you a grad student? I think I'm missing out on something, you have more money than I do! I thought students were broke! I've been planning to buy the ESP-950 for years, but keep building amps instead and spend all my money on amps. I should probably stop for a while and buy some headphones!
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