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6P45S PPP Monoblocks.
6P45S PPP Monoblocks.
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Old 1st January 2019, 09:13 PM   #1
kodabmx is offline kodabmx  Canada
Affordable triode connected sweep tube amps.
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6P45S PPP Monoblocks.
Default 6P45S PPP Monoblocks.

See 6P45S PPP Monoblocks. for the latest schematics.
So I've decided to cannibalise some of my other amps that collect dust to build 2 6P45S monoblocks.

Triode connection. B+=290V-320V. Idle 120mA/tube. Load=650R or 1300R EDIT: 2600R

Basically, I'm thinking of building the amp I have with both channels in parallel. In PPCalc:
With a 1300RLa-a, I get 22.5W class A, 119W total.

What do you think? This entire project will only cost me the price of the chassis.

R1-R4 = 10R. R5-R8 1k = R9-R12 = 220k
The OPT will be made of two Triad VPT18-13800 in parallel. (500VA)
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Last edited by kodabmx; 5th March 2019 at 04:00 AM.
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Old 1st January 2019, 09:46 PM   #2
Lingwendil is offline Lingwendil  United States
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6P45S PPP Monoblocks.
As shown your bias will fight eachother, you need a way to isolate the grids.

What monster of a speaker are you driving that needs 170W of drive?

I would be inclined to just build a four channel setup, with dual stereoblocks in all honesty
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Old 1st January 2019, 09:53 PM   #3
kodabmx is offline kodabmx  Canada
Affordable triode connected sweep tube amps.
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6P45S PPP Monoblocks.
Good catch They each need their own coupling cap and grid leak.

170W from "triodes" for less than the price of 30W from a pair of 300B
And due to a miscalculation, I can't use 1k3, but I can use 2k6. I would get 56W of class A power with 0.015% third, and 0.0000787 fifth! Bet that amp would sound better than anything I've built, eh?!
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Last edited by kodabmx; 1st January 2019 at 10:05 PM.
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Old 13th January 2019, 08:02 PM   #4
kodabmx is offline kodabmx  Canada
Affordable triode connected sweep tube amps.
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Join Date: Oct 2011
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6P45S PPP Monoblocks.
So I've built one of them now.

So far, so good.
Hot tip: Heater cord works well for top caps. 300V rated (so good to much higher than that in practice) and 105c rated, too.

Just waiting on my older amplifier to scavenge for parts (my friend was "testing" it for me) and I'll make the second one.
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Old 14th January 2019, 01:28 AM   #5
multi is offline multi  Australia
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I use teflon wire to top caps.
With high voltage use the teflon with a teflon tube.
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Old 15th January 2019, 06:23 PM   #6
kodabmx is offline kodabmx  Canada
Affordable triode connected sweep tube amps.
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6P45S PPP Monoblocks.
Nice, but in this design there is no reason to. B+ is only 320V, and heater cord is 70 cents per foot for 16/2. Voltage rating is mostly a liability thing. This wire insulation is probably good to 2kV, but if it isn't, you can't sue them.
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Old 16th January 2019, 04:39 AM   #7
multi is offline multi  Australia
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Can you show the power supply. Please; I have 1.5k out put transformer sowter. Also 2k toriody from Poland. Have 100+DB speakers, so no need for 4 x 6P45s
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Old 16th January 2019, 01:15 PM   #8
kodabmx is offline kodabmx  Canada
Affordable triode connected sweep tube amps.
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6P45S PPP Monoblocks.
Voila.

This is as it's built now, but I've used one of these for it, too. 500W 12VDC transfer 18VAC & 0-220v-380v inverter module | eBay
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Last edited by kodabmx; 16th January 2019 at 01:18 PM.
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Old 18th January 2019, 04:40 PM   #9
kodabmx is offline kodabmx  Canada
Affordable triode connected sweep tube amps.
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6P45S PPP Monoblocks.
Well I finished them. Here's a pic of one of the second one.
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Old 25th February 2019, 08:14 PM   #10
kodabmx is offline kodabmx  Canada
Affordable triode connected sweep tube amps.
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6P45S PPP Monoblocks.
Default Heater rectifier diodes

So right now, I'm using 6A10 diodes for the heater supply. I get only 11.4V loaded which is -10% of the rated voltage. I found the SM74611 diode with a forward drop of only 26mV @ 8A, but there are surface mount.

Any reason I can't just dead bug them?
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