This is good, Upupa: DHLMC, direct heated LM-chips 
Ohhh, I played a lot with different anode voltages with the E88CC and I think, I know now, what I prefer
Franz
P.S.
Don't forget: this is a fun project, like this audion radio, using DF651 tubes:
Ohhh, I played a lot with different anode voltages with the E88CC and I think, I know now, what I prefer
Franz
P.S.
Don't forget: this is a fun project, like this audion radio, using DF651 tubes:
An externally hosted image should be here but it was not working when we last tested it.
This are very sensitive crystal (!) headphones. The brand is Brush, out of USA of the 30ies of last century.
It is my most sensitive headphone, much more than my 4000 Ohm Telefunken, I inherited from my father
BTW, back to the topic:
It will fit in the small box, as it seems.
Franz
It is my most sensitive headphone, much more than my 4000 Ohm Telefunken, I inherited from my father
BTW, back to the topic:
It will fit in the small box, as it seems.
An externally hosted image should be here but it was not working when we last tested it.
Franz
Hey Franz-
Holly cow!!
Earlier today you posted the following:
"I am preparing a pcb and of course: fitting in all parts will be a challenge, as I did not find any SMD tube sockets .
Franz"
And now you have a completed PCB!!
That was like 6 hr service? How did you have it made so quickly, and did you have extra made?
Holly cow!!
Earlier today you posted the following:
"I am preparing a pcb and of course: fitting in all parts will be a challenge, as I did not find any SMD tube sockets .
Franz"
And now you have a completed PCB!!
That was like 6 hr service? How did you have it made so quickly, and did you have extra made?
I made it in the meantime! Recycled another board in Corel Draw, printing on glossy ink jet paper with the laserprinter, transfering with the iron, edging (wrong word?) with "Eisenchlorid III" (dont know the word).
And this will be the power humpty:
An externally hosted image should be here but it was not working when we last tested it.
Good Night!
Franz
Edit: Wanna see the board? Not professional, but it will work:
An externally hosted image should be here but it was not working when we last tested it.
Heureka!
Dreaming last night, I remembered this Revox M40 Stereoamp:
Thats it!
Just "lift" the tube socket, fix it with a screw and a distant holder (maybe enforced with some epoxy) on the board, an win space for resistors and coupling caps!
This gives me several other advantages:
- There is a central screw, to fix the board at the box
- The space on the pcb, formerly planned for the coupling caps can now be used for connector pins for the PSU.
- more space for a better grounding scheme (I was unhappy with the first design)
- no more direct heated chips and caps, as the tube is completely outside of the box
This is the better pcb-layout:
BTW: how can you post thumbnail pictures, that enlarge by clicking on it?
Franz
Dreaming last night, I remembered this Revox M40 Stereoamp:
An externally hosted image should be here but it was not working when we last tested it.
Thats it!
Just "lift" the tube socket, fix it with a screw and a distant holder (maybe enforced with some epoxy) on the board, an win space for resistors and coupling caps!
This gives me several other advantages:
- There is a central screw, to fix the board at the box
- The space on the pcb, formerly planned for the coupling caps can now be used for connector pins for the PSU.
- more space for a better grounding scheme (I was unhappy with the first design)
- no more direct heated chips and caps, as the tube is completely outside of the box
This is the better pcb-layout:
An externally hosted image should be here but it was not working when we last tested it.
BTW: how can you post thumbnail pictures, that enlarge by clicking on it?
Franz
An externally hosted image should be here but it was not working when we last tested it.
Like this?
You can host pics here then if you wanted:
http://imageshack.us/index3.php
Nice projects BTW!
Thought you were gonna back off from gainclones since beeing at the european triode festival with Hiraga and the guys!? (just read the report)
And yes Lindt is my absolute favourite.
After that I prefer Thorntons from the UK.
(almost missed my last flight buying some fudge of them)
Jens
Yes, this must be confusing: In fact, I learned at the ETF, that I really prefer tube amps! And with my latest PL519 amp, I have a very very very good amp!
But it is fun, to build such a small amp like this mini gainclone! Maybe, 47labs will clone this one?
Next project will be the 6S45 SPUD.
BTW: I dont like imageshack, specially not the pop up windows, following. Sorry!
Mit freundlichen Grüssen
Franz
Yes, this must be confusing: In fact, I learned at the ETF, that I really prefer tube amps! And with my latest PL519 amp, I have a very very very good amp!
But it is fun, to build such a small amp like this mini gainclone! Maybe, 47labs will clone this one?
Next project will be the 6S45 SPUD.
BTW: I dont like imageshack, specially not the pop up windows, following. Sorry!
Mit freundlichen Grüssen
Franz
Don't copy my PCB, as there are at least two errors on it:
- one pin for the poti at the wrong place
- forgot the input resistors
Both problems could be solved (the input resistor in series with the coupling C under the tube socket, the poti with a little bit wire.
Standing on the future powerhumpty. Maybe attach a small anodized frontplate?
Inside, view under the socket.
Franz
- one pin for the poti at the wrong place
- forgot the input resistors
Both problems could be solved (the input resistor in series with the coupling C under the tube socket, the poti with a little bit wire.
An externally hosted image should be here but it was not working when we last tested it.
Standing on the future powerhumpty. Maybe attach a small anodized frontplate?
An externally hosted image should be here but it was not working when we last tested it.
Inside, view under the socket.
Franz
Mini society:
Franz
An externally hosted image should be here but it was not working when we last tested it.
Franz
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