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Old 7th February 2013, 03:34 AM   #4741
AJT is offline AJT  Philippines
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Quote:
Originally Posted by nvduybom View Post
@Tony :

Looks good preamp .

I think the sound may be better with carbon resistors , especially resistors signal .
i do use carbon composition resistors as grid stoppers......
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Old 7th February 2013, 10:20 AM   #4742
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Originally Posted by Stixx View Post
My C3G spud headphone amplifier is finally finished and playing music.

- C3G triode wired running at 145V / 15mA
- Cathode bias with tightly matched Morganite resistors and BG N bypass caps
- (yes, there is still people preferring a conventional setup over LED bias , but only when Black Gates are used)
- Salas SSHV2 with LC prefilter
- DC heaters
- Lundahl LL1689 wired 18:1
- custom wound toroid mounted on top
- all the guts underneath

Absolutely dead silent (Pitch Black background... ).
Wow amazing work, congrats
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Old 8th February 2013, 07:14 PM   #4743
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finished my tube preamplifier
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Old 8th February 2013, 08:45 PM   #4744
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Very nice on all the last photos posted. I love seeing them.
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Old 8th February 2013, 11:04 PM   #4745
12B4A is offline 12B4A  United States
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After tracking down a noise issue I finally got this one working. I won't say I'm done with it but it is going to stay this way for awhile.

6N1P Broskie CCDA driving TJ 205D parafeed. 205D is at 350V/20mA/-20V cathode bias. 6N1P is at 165V/5mA/-3V unbypassed cathode bias. MQ BCP-15 plate choke and EXO-35 iron (yeah I know...5k:8 on 205D...feels good man). Many parts were salvaged from previously dismantled projects so there's some battle scars underneath. If I could completely redo it I'd figure out a way to make the wiring a little more tidy but all things considered I'm happy with how it turned out.
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Old 8th February 2013, 11:42 PM   #4746
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12B4A: I like the 205's. Very nice build all round.
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Old 9th February 2013, 01:13 AM   #4747
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Wachtfels666 AND 12B4A.... Beautiful work. Thanks for sharing.
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Old 9th February 2013, 02:01 AM   #4748
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Very nice build! But... why I don't trust cable ties holding heavy capacitors with high voltage on them, in hot environment?
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Old 9th February 2013, 02:36 AM   #4749
12B4A is offline 12B4A  United States
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Quote:
Originally Posted by Wavebourn View Post
Very nice build! But... why I don't trust cable ties holding heavy capacitors with high voltage on them, in hot environment?
I used anchors with screws so no adhesive delamination (if you've had an accident with this method then please say so). The amp runs barely warm as well, a little less than 80VA total consumed on a 17x12x3 by 6mm thick aluminum chassis with vents directly over the resistors dissipating heat and holes in the bottom plate to allow convection path. 1 watt per channel output with 80 watts consumed, yes, almost enough for headphones.
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Old 9th February 2013, 06:20 AM   #4750
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Wachtfels666, nice work! You should take a photo of the EM84s working!

12B4A: looks great! have you thought about painting the transformer cover white?
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