My sweet plywood amp
That collor reminds me of the inside of a MIG jet fighter, it was supposed to have a psychological effect on the pilots. Great work and nicely done!
Edit are those tubes the SR552? great GU50 equivalent made by the RFT company up in East Berlin. If so, i take it that you are running them in triode?
At what G2 voltage? If my memory serves me right you cant go over 250V VG2 without risking damage to the screen grids. But perhaps Wave bourn can chip in. Very, Very nice tubes in any case, i believe the anode is solid nickel with zirconium getter sintered on. This makes the tube virtually indestructible, if you red plate it, it will getter the gas that is cooked off from the metals..
The LS50 is the grandfather of a couple of other transmitter tubes, after the war the Russians stripped the entire Telefunken factory and set up production for the GU50 in the Urals.
The problem with some tubes with low screen grid maximum voltages 6P45S is another example, is that when the anode swings below the screen grid the grid can see too much dissipation, you can run a 1K-2K2 resistor in series with G2 to limit dissipation somewhat.
PS, some of the equiptment for the production of SR552 was saved from the scrap-heap and is now on display in a technical museum in Berlin, Industriesalon Shöneweide ?
The LS50 is the grandfather of a couple of other transmitter tubes, after the war the Russians stripped the entire Telefunken factory and set up production for the GU50 in the Urals.
The problem with some tubes with low screen grid maximum voltages 6P45S is another example, is that when the anode swings below the screen grid the grid can see too much dissipation, you can run a 1K-2K2 resistor in series with G2 to limit dissipation somewhat.
PS, some of the equiptment for the production of SR552 was saved from the scrap-heap and is now on display in a technical museum in Berlin, Industriesalon Shöneweide ?
In fact, I borrowed this color from the Bruel&Kjaer
You are right, this is SRS552 but i run them in pentode.
I knew I had seen that colour!!! Half of our research group is in acoustics and I think there is a lot of Bruel&Kjear in their labs. That amp of yours looks just as pretty
I take its a classic mosfet source follower? If you need a nice mosfet for a new design, 2SK3554 is really nice with a 10pF miller capacitance
I absolutely adore the build quality on that, PS. Have you heard of TopoR by Eremex? You can autoroute pcb”s that look vintage
Also where do you get those eyelets you used?
No. But i like to use SprintLayout. Recently, I have been using a CNC milling machine to make PCBs and SprintLayout is well suited for this.
This is the military version of the 555 timer.
It is used for soft-start.I stopped etching boards some years back because JLCPCB is cheaper than the base material (Bungard photo FR4) Not to speak the pants and shirts i had to put in the trash because of the of the Fe3Cl stains on my clothes. That and the fact everything in the shed started to rust once i began etching...
I use an Ancient version of Eagle, but what is nice is that you can import eagle board files into TopoR, and rout manually. The autorouter is Genius, but then again what do you expect from the Russians. Dont you have a saying that roughly means working on your knees with a piece of paper?
Edit: a millspec 555 that is genius, is it true that all Russian dip packages are 2.5mm instead of 2.54mm pitch?
I use an Ancient version of Eagle, but what is nice is that you can import eagle board files into TopoR, and rout manually. The autorouter is Genius, but then again what do you expect from the Russians. Dont you have a saying that roughly means working on your knees with a piece of paper?
Edit: a millspec 555 that is genius, is it true that all Russian dip packages are 2.5mm instead of 2.54mm pitch?
Nice looking I like the choice of color, I see you have sandwich the wood between the aluminium plates I had done that on my EL34 chassie.My sweet plywood amp
My sweet plywood amp
That is one of the sweetest builds I think I've seen. I don't know how it sounds but I'm droolin'!