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Old 16th March 2013, 04:48 AM   #91
Pdwhitt is offline Pdwhitt  United States
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Join Date: Apr 2012
I would like to add a power on indicator lamp. Can anyone suggest where along the circuit and how to go about it?
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Old 16th March 2013, 11:30 AM   #92
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Quote:
Originally Posted by Pdwhitt View Post
I would like to add a power on indicator lamp. Can anyone suggest where along the circuit and how to go about it?
6.3V lamp - can get them at Radio Shack or angela instruments - use your 6.3V heater supply to power the lamp. Drill hole in chassis, mount lamp wire it from the 6.3V heater supply, it will turn on when you turn on your amp.

Here's a link to what they look like:

Blue Jewel Pilot Light Assembly For Tube Amp Projects.

Cheers,
Bob
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Old 16th March 2013, 02:08 PM   #93
Pdwhitt is offline Pdwhitt  United States
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Thank you so much Bob!

Paul
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Old 21st March 2013, 02:16 PM   #94
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Dear Siliconray,

I have your 6P3P kit. Which I have upgraded the valve. I am looking to change to a pair of transformer my friend has given me, I think it is a 5K winding, What do I need to change in your circuit to accept a 5K winding?

Thanks,

Oon
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Old 23rd March 2013, 06:19 AM   #95
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The best impedance for 6P3P is 3.5k. 5K is usable but the power is lower. Nothing need to be changed. The best impedance is determined by the tube's parameters.
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Old 25th March 2013, 02:49 PM   #96
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Ok thanks...

Oon
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Old 4th April 2013, 06:25 PM   #97
Pdwhitt is offline Pdwhitt  United States
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I've read the threads on the Siliconray 6P3P and I'm looking forward to getting started on my build. This is an open ended question and I'm sure a lot of opinions, but as far as upgrades, which ones will give me the most bang for the buck? The best sonic improvements. New tubes, capacitors, transformers, resistors or volume pot?

Btw, thanks to everyone who has already provided such great info.

Paul
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Old 6th April 2013, 01:52 PM   #98
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Location: Plymouth, England
I am considering buying one of these amps for driving the tweeters in my 3 way active system. I was using a Ming Da MC84-C PP amp, but it has terrible hum issues in my system. It works OK as a stand-alone amp, but doesn't like mixing in with the rest of my gear. If I can't resolve the hum problem, would one of these 6P3P amps work as a HF amp? 8 watts is plenty, but is the HF response delicate enough?
Any opinions? Changing caps and resistors is no problem, I have plenty of PIO and polyprop caps and resistors are cheap enough.
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Old 6th April 2013, 06:18 PM   #99
DucTom is offline DucTom  Austria
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Peruanische Issing a groundloft swich to correct the hum.
You have a hum Circle with your Earth and mass connections.
Groundlift Opens the the Connection betwen Maßband Earth in the Amp.
DucTom
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Old 23rd April 2013, 12:20 AM   #100
Pdwhitt is offline Pdwhitt  United States
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6p3p components explained.

Using the schematic for the SiliconRay 6p3p amp, I will attempt to explain in simple terms each component. You guys that know a lot more than I, please jump in to make any corrections.

Power Supply
Power supply transformer- transforms 120 (or 220) volt AC wall current from the primary winding into various AC voltages required by the amp. The secondary winding produces 300v power for the preamp and power tubes, and heater voltages for the tubes (6.3v for the power tubes, 5v for the rectifier tube, and 3.15v for the preamp tube).
5z4p rectifier tube - converts the 300 AC volts to DC for the preamp and power tubes.
Capacitors 47uf/450v, 330uf/450v, and 22uf/450v are filters which remove the ripples from the output of the rectifier tube, by passing the 60 (or 50) Hertz AC portion of the signal to ground, while allowing the smooth DC to be used as the B+ power for the preamp and power tubes.
Power supply choke coil 5H further smooths the DC signal by blocking any alternating current.
The 22k resistor and two 47k resistors decrease the voltage for use by the 6n1 preamp tube.

Amplifier
Potentiometer 100K
acts as the volume control by adjusting the input level before passing it to the preamp tube.
6n1 is a dual triode tube, and amplifies both the left and right signals before reaching the main power tubes. The tube is heated through pins 4 and 5 with 3.15 volts from the power transformer. Amplification occurs as the low voltage signal input from pins 2 and 7 passes across the grid, and influences the movement of electrons from the negative cathode pins 3 and 8 to the positive plate pins 1 and 6.
1k resistors connected to pins 3 and 8 of tube 6n1 act to bias the preamp and keep the cathode at a more positive voltage compared to the grid.
0.33uf coupling capacitors block any DC portion of the 6n1 preamp output before entering the 6p3p power tubes.
470 k leak resistors set the level from the preamp output to the grid of the power tubes.
6p3p - pentode main power amp tubes. The tube is heated through pins 2 and 7 with 6.3 volts from the power transformer. Amplification occurs as the preamp signal output enters pin 5, passes across the grid, and influences the movement of electrons from the negative cathode pin 8, to the screen pin 4, and positive plate pin 3.
330k cathode resistors bias the tube and keep the cathode at a more positive voltage compared to the grid.
470u/35v cathode bypass capacitors act along with the cathode resistors 330k to provide bass reduction.
Output transformers - transform the high voltage, low amperage output of the 6p3p power tubes, to low voltage, high impedance required by either 4 or 8 ohm speakers.
10k resistors provide negative feedback to the 6n1 preamp tube from the output transformers, and slightly decrease the overall volume, but improve frequency response and decrease distortion.
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