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Old 6th March 2013, 02:49 PM   #541
iko is offline iko  Canada
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peekchuuurss!
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Old 6th March 2013, 02:52 PM   #542
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Gee, and I thought you would have wanted the schematic.

I'll take pictures so you can get a good chuckle from my spaghetti monster mess.
Try not to laugh too hard.
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Old 7th March 2013, 03:51 AM   #543
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Hi,

Schematics would be welcome if it's not a hassle, I have a quad of these with a schematic for a PSE but didn't get around yet..LOL

TIA,
Eric
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Old 7th March 2013, 06:48 AM   #544
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I'm glad a few of us now have working models. Mine has been in my system now for several months and I'm hugely satisfied. It has been trouble free and is easily the best amp I've built in 30 years. It drives a pair of infinite baffle columns of around 21 litres with Mark Audio Alpair 10s (Mk.1).

Here are the schematics - three stages with the first stage (line) in a separate chassis with its own power supply. Every tube is in filament bias and has a DC filament supply with choke input and a Rod Coleman regulator. So three outboard boxes, each containing a pair of supplies.
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File Type: png 4P1L_PSE_Amp.png (78.9 KB, 564 views)
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Old 7th March 2013, 03:24 PM   #545
Pano is online now Pano  United States
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I'll post mine this evening. It's simpler than Andy's, but works well for me.
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Old 7th March 2013, 09:13 PM   #546
Pano is online now Pano  United States
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Here's my crazy contraption. Looks a fright, works a delight! Actually very quiet on my ~95dB/W system. The low gain helps.
Not shown is the filament supply. One 6.3V winding goes to the rectifier tube, the other goes to the 6SN7 and the regulator for the 4P1L filaments. The 4P1L cathode shown on the schematic is the middle point of the filament. 1R is just there to measure current.

Bias on the 6SN7 is set with 2 red LEDs in series, or about 3.4V Bias on the 4P1L is 2x9V in batteries in series with 2X AA (1.5V) batteries.
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Old 7th March 2013, 09:37 PM   #547
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Great prototype and a nice clean schematic! Thanks!
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Old 8th March 2013, 04:27 PM   #548
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Default first test 4pl1

Click the image to open in full size.PC900 4pl1- really good mixClick the image to open in full size.

Last edited by FRUGIVO; 8th March 2013 at 04:35 PM.
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Old 8th March 2013, 04:35 PM   #549
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Now that's a stacked amp! I like it.
What's the input tube?
EDIT: Oh, I see, the PC900 is a UHF triode.
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Old 8th March 2013, 04:40 PM   #550
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Quote:
Originally Posted by Pano View Post
Now that's a stacked amp! I like it.
What's the input tube?
driver is a PC900 used as RF amplifier tv
very good tone!!
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