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[SripBoard Design] Starving Student Millett Hybrid Vacum Tube Amp - Page 11

post #151 of 269
Thread Starter 

@BangDead How is Design going? Looked at my 3.7 yet?

 

Should get soldering soon, need some stripboard, what i had left is not big enough...

 

Also 3.7.1 Coming soon. Anyone still with me?

post #152 of 269
Thread Starter 

So it begins, Nothing can stop me now.

photo.JPG

post #153 of 269

R3 and R9 will be soldered very close to the MOSFET gates?

 

Looking good.

post #154 of 269
Thread Starter 

No worries, they will be soldered directly on the gate pin.

 

Thanks

post #155 of 269
Thread Starter 

Its coming along ok. Except I got mixed up in some capacitor size, after a little shuffling around, back on track.

 

photo (2).JPG

 

God like soldering skills (not really, thick soldering wire doesnt help.)

 

photo (1).JPG

post #156 of 269
Thread Starter 

Looks like I am done with the circuit.

 

 

IMG_0313.JPG

 

Next the box.

post #157 of 269
Thread Starter 

I am a little confused on the type of wire i should use for the Transistors, Would ruban cable work?

 

IMG_0315.JPG

post #158 of 269

Anything around 24 gauge or bigger should work fine for the source and drain. Smaller stuff would be ok for the gate.

post #159 of 269
Thread Starter 

A first review of the completed box:

 

IMG_0317.JPG

post #160 of 269
Thread Starter 

Any tips on how to add some LEDs under the tube circuit wise?

 

Also:

 

photo (3).JPG

 

Case need to be varnished and the external components needs to be soldered in, I should be done sometime today.

post #161 of 269

 

Quote:
Originally Posted by TestSubject View Post

Any tips on how to add some LEDs under the tube circuit wise?

 


If your sockets have the little holes through the center the common practice is to stick the LED's in the holes and wire them and their resistors in. 

post #162 of 269
Thread Starter 

And its done, everything is wired up and double checked. When i plug it in, with a source active, nothing happens, no sound nothing glows inside the tubes, nothing at all. A little annoyed.

 

Is there any ways to check if the tubes are OK?

 

Checked conductivity between pin 4 and 5, and nothing.

 

EDIT: 9 and 4, 9 and 5 conducts

 

EIA-9A.png


Edited by TestSubject - 12/26/11 at 6:53am
post #163 of 269

Some of the power supplies struggle a little to fire up a cold amp, so the power supply may cycle on and off a few times until the heaters get hot.

 

It takes the heaters more than a few seconds to get hot enough to warm the cathode sufficiently to begin emitting electrons, completing the circuit and allowing you to hear music.

post #164 of 269
Thread Starter 

Ok thanks, I am turning it on right now, ill wait a couple of minutes and see... I mean hear how it goes.

 

Ill keep you posted.

 

EDIT: After a good 20 minutes still nothing.


Edited by TestSubject - 12/26/11 at 7:48am
post #165 of 269

You double check the pinout on the mostest? The pinout on the devices does not match the pinout on your board.

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