Hi Radu...
On this picture of your amp.
https://simplepleasuretubeamps.files.wordpress.com/2013/05/dsc00432.jpg
Is the Pot min/Max a volume control, or Is it for some kin of adjustment of
the current flow etc.
/Michael
First, the picture is of the pushpull amp. But is similar to PSE. It is for volume control. At that time, I chose to have independent volume control per channel. I did not have another way to adjust volume when using with CD player
Hi Radu.
I have read everything on your "shiny eyes" blog. According to your schematic I can
see that a huge amount of power is going throught the cathode resistors...
Is it really these numbers ???
power - 280v*120ma = 33.6 watt
driver - 15*560ma = 8.4 watt
PSE - 28*1300ma = 36.4 watt
And for a Stereo (33.6+8.4+36.4)*2 = 156.8 watt.
I thing I have read that Andy's power consumption on his 4P1L PSE was about 100 watt.
Have you tried to measure yours ??
I can see on both of your schematic that you're using huge resistors, don't the get really really hot ??
PS! Need to draw your schematics in LtSpice, but I have never done one with a transformer so i will take some learning time.
/Thanks Michael.
I have read everything on your "shiny eyes" blog. According to your schematic I can
see that a huge amount of power is going throught the cathode resistors...
Is it really these numbers ???
power - 280v*120ma = 33.6 watt
driver - 15*560ma = 8.4 watt
PSE - 28*1300ma = 36.4 watt
And for a Stereo (33.6+8.4+36.4)*2 = 156.8 watt.
I thing I have read that Andy's power consumption on his 4P1L PSE was about 100 watt.
Have you tried to measure yours ??
I can see on both of your schematic that you're using huge resistors, don't the get really really hot ??
PS! Need to draw your schematics in LtSpice, but I have never done one with a transformer so i will take some learning time.
/Thanks Michael.
Well, yes if fixed bias sounded as good as filament bias. In both cases we don't have the cathode bypass cap, so that's progress. I have tried fixed bias but haven't yet got it to sound as good as filament bias. I do have a kit that Rod Coleman kindly sent me, but I haven't had time to build it yet - I've been very busy with work. I'm personally not worried about the power consumption - since my outputs are 4P1Ls I've saved a ton of money over using 300bs, so I'm well ahead.
Hi Michael,
The power consumption is about 270VA ( I measured using an energy monitor such as thishttp://www.amazon.com/P3-P4400-Electricity-Usage-Monitor/dp/B00009MDBU/ref=pd_bxgy_hi_img_z)
I know it is a huge consumption ( prety much the energy efficiency of this device is close to zero) but the sound is rewarding. I am happy to use it in the winter though...radiates a good amount of heat.
The resistors in the cathode ( filament) circuit dissipate about 27W ( for the final stage ) and they get very hot ( can't be touched). I can run the amp 24 hours continuously and after an hour or so the temperature reaches a stabil point and things are not drifting anymore.
All. I can say is that I am very happy with the amp except for its weight.
Best,
Radu
This is for smoothing the B+ before the Glow Tube VR, not as an anode load. I use interstage transformers. The device is mounted on a small heatsink which is isolated from the chassis.
Attachments
I'm starting another build of the 4P1L > 4P1L PSE, which I first built in Autumn 2012. Circuit hasn't changed in the 3 years it's been my daily amp, and I haven't had any reason to try a different circuit. I'm more than happy. Just a re-visit to see if anything's changed.
Anybody else using a PSE 4P1L amp?
Anybody else using a PSE 4P1L amp?
... not yet.
I build up a little stock of 4P1L's, have experimented with them a little, but all in all I'm still in the planning phase for such PSE amp.
Ulrich
I´m working on following designs:
https://simplepleasuretubeamps.word...e-all-4p1l-prototype-amplifier-final-testing/
http://www.bartola.co.uk/valves/wp-content/uploads/2012/12/4P1L-PSE-version-01.png
... more to come...
https://simplepleasuretubeamps.word...e-all-4p1l-prototype-amplifier-final-testing/
http://www.bartola.co.uk/valves/wp-content/uploads/2012/12/4P1L-PSE-version-01.png
... more to come...
i did....i used 6j9 input wired as triode and 6n1p as broskie cathode follower to drive the 4P1L grids......
An externally hosted image should be here but it was not working when we last tested it.
These are more or less the circuit I built with slight variations - Radu is very close and Ale has fixed bias for the finals. Voltages and currents are all similar. Let us know how it goes. You get very good sound from this circuit.
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Hi,
no, octals won't work. Personally I like these very much, but prices went up considerably
Ceramic Loctal 8 B8G Sylvania 1938 Socket 12G1L 12P17L 2G27L 2P29L 4P1L | eBay
You can have a look at Ask jan first, search his website for Loktal
Frag Jan zuerst- Ask Jan first: Roehren und mehr
cheers, Erik
no, octals won't work. Personally I like these very much, but prices went up considerably
Ceramic Loctal 8 B8G Sylvania 1938 Socket 12G1L 12P17L 2G27L 2P29L 4P1L | eBay
You can have a look at Ask jan first, search his website for Loktal
Frag Jan zuerst- Ask Jan first: Roehren und mehr
cheers, Erik
... octal have to be replaced by loctal (3D definition pending: will order some PCB loctal sockets from Loktal Gold Print - röhrenhaus.de).
2 Maida regulators placed.
First CCCV regulator placed (needs 3 more and the raw DC voltage!).
... more coming...
2 Maida regulators placed.
First CCCV regulator placed (needs 3 more and the raw DC voltage!).
... more coming...
