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Old 13th December 2012, 03:45 AM   #161
freax is offline freax  Australia
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I'm hunting bovine, hahhahahhahaha

upholstery leather | eBay
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Old 17th December 2012, 11:55 PM   #162
freax is offline freax  Australia
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Just so everyone knows as to the quality of this amp I'll post some pictures:

Click the image to open in full size.
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Construction will begin later on today sometime after I stop having a heart attack from yesterdays bull, I'll have to wing it in regards to the upholstery because I want this thing finished by christmas, its my christmas present to myself.

No matter how tempted I am to try those UK handmade PIO capacitors in my DAC.

I should be able to fit the upholstery after its assembled, lifting of the transformers inorder to get it underneath, etc.
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Last edited by freax; 18th December 2012 at 12:01 AM.
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Old 18th December 2012, 09:28 AM   #163
IanS1 is offline IanS1  United Kingdom
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Looks very well packed. I should have my full kit on it's way to me any day now. Not sure I'll get it in time for Christmas though.
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Old 18th December 2012, 10:25 AM   #164
freax is offline freax  Australia
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Quote:
Originally Posted by IanS1 View Post
Looks very well packed. I should have my full kit on it's way to me any day now. Not sure I'll get it in time for Christmas though.
*hugs*

You should have fun with it, just get a good sleep before hand.

I have done about 50% of mine already, but I was really tired, no matter though I'm taking it slow and will recheck everything before powerup.
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Old 19th December 2012, 07:14 AM   #165
freax is offline freax  Australia
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Feel like I've been on a passenger train for the last 7 hours.

You might notice that I didn't use the included 9-pin socket, I instead stuck a Russian Ceramic 9-pin socket in there, the way I figured it I wanted a Russian Socket to go with a Russian tube, and I just love Ceramic, even though Plastic does survive better, I still have nightmares of cracked bakelite sockets from amplifiers and radios in my past.

Here are some pics while I take another break and eat dinner:
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Last edited by freax; 19th December 2012 at 07:22 AM.
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Old 19th December 2012, 11:45 AM   #166
freax is offline freax  Australia
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You state that I need to connect a 100k 2 watt resistor to the B+ to discharge them after testing.....On page 39.

However there is none supplied with the kit.

So rather be safe than dead I shorted the capacitor with a big nasty ugly very well insulated screwdriver, it was sitting at about 450vDC at the time. (this was done while waiting FOREVER for them to slowly discharge with the kit disconnected from the mains...)

Needless to say my ears rung afterwoods....

I strongly suggest that some sort of bleeder resistor is put in place before the capacitors are shipped so this kind of stuff doesn't happen again.

Whats the word on these capacitors being damaged, and by that I mean the two big assed 50uF capacitors?

Nothing else looks or smells damaged, not even the two leads coming from the other capacitor.
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Last edited by freax; 19th December 2012 at 12:02 PM.
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Old 19th December 2012, 12:00 PM   #167
freax is offline freax  Australia
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Btw the voltages have all checked out:
771vAC for the unregulated AC B+
376vAC for the half CT B+
376vAC again for the other half.
5.5vAC for the Rectifier filament.
6.43vAC for the main filament bus.

and 551vDC for the filtered DC B+

My mains voltage is probably a little low here so that would explain the slightly lower readings than spec.
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Old 19th December 2012, 12:14 PM   #168
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Well just about ANY high-value resistor would have been better that direct shorting them with a screwdriver. The caps are probably OK, but I would not suggest doing it that way again.

When the circuit is fully wired, the caps will bleed down very quickly after power is removed.

Maybe I should include a bleeder resistor, however the capacitors are not charged when I ship them. No reason to put a bleeder resistor in place before shipping. I've never bought a cap that came with a bleeder resistor pre-attached.



Quote:
Originally Posted by freax View Post
You state that I need to connect a 100k 2 watt resistor to the B+ to discharge them after testing.....On page 39.

However there is none supplied with the kit.

So rather be safe than dead I shorted the capacitor with a big nasty ugly very well insulated screwdriver, it was sitting at about 450vDC at the time. (this was done while waiting FOREVER for them to slowly discharge with the kit disconnected from the mains...)

Needless to say my ears rung afterwoods....

I strongly suggest that some sort of bleeder resistor is put in place before the capacitors are shipped so this kind of stuff doesn't happen again.

Whats the word on these capacitors being damaged, and by that I mean the two big assed 50uF capacitors?

Nothing else looks or smells damaged, not even the two leads coming from the other capacitor.
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Old 19th December 2012, 12:48 PM   #169
freax is offline freax  Australia
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Quote:
Originally Posted by scott17 View Post
Well just about ANY high-value resistor would have been better that direct shorting them with a screwdriver. The caps are probably OK, but I would not suggest doing it that way again.

When the circuit is fully wired, the caps will bleed down very quickly after power is removed.

Maybe I should include a bleeder resistor, however the capacitors are not charged when I ship them. No reason to put a bleeder resistor in place before shipping. I've never bought a cap that came with a bleeder resistor pre-attached.
The amp is working fine, I'm listening to it right now and have been for 15 minutes.

Indeed, but your instructions state to test the B+ without output tubes installed, then magically produce a resistor that will discharge it before continuing further, check carefully page 39, you will notice that this B+ test is done with just the rectifier tube in place.

All I had available was 1/8 watt ones and I wasnt confident in their voltage ratings, and I didn't feel like hooking up a 10 ohm or 5 ohm 5 watt ceramic resistor to a 450vDC bus and watching it blow up as thats all that I had in the large value ranges.

Anyway, a cautionary tale best left for some other time and some other place.
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Last edited by freax; 19th December 2012 at 12:52 PM.
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Old 19th December 2012, 12:54 PM   #170
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Quote:
Originally Posted by freax View Post
Indeed, but your instructions state to test the B+ without output tubes installed, then magically produce a resistor that will discharge it before continuing further, check carefully page 39, you will notice that this B+ test is done with just the rectifier tube in place.
Well, the very first page of the manual states:

PLEASE READ THIS MANUAL IN IT'S ENTIRETY BEFORE BEGINNING ASSEMBLY

I'm glad you've got it working. That was a pretty quick build.
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