Search found 312 matches

by kleuck
23 May 2013, 20:34
Forum: Amplifiers
Topic: A 3 watts KISS amp / single tube ECL82/6BM8/6F3P
Replies: 118
Views: 46150

Re: A 3 watts KISS amp / single tube ECL82/6BM8/6F3P

Spring retainer http://farm8.staticflickr.com/7286/8795115309_85454101e4_c.jpg Back to 560 Ohms : http://farm4.staticflickr.com/3781/8795114051_9e16598982_c.jpg The bias was too high actually, the was loosing definition and power after 10', current going up. I've been fooled once again by really NOS...
by kleuck
20 May 2013, 00:53
Forum: Amplifiers
Topic: A 3 watts KISS amp / single tube ECL82/6BM8/6F3P
Replies: 118
Views: 46150

Re: A 3 watts KISS amp / single tube ECL82/6BM8/6F3P

New vid, with my new speaker, a Red Fang 10" : https://youtu.be/4GyagcosWe4
by kleuck
30 Apr 2013, 15:21
Forum: Amplifiers
Topic: A 3 watts KISS amp / single tube ECL82/6BM8/6F3P
Replies: 118
Views: 46150

Re: A 3 watts KISS amp / single tube ECL82/6BM8/6F3P

I fined-tuned the power, the compression at full tilt etc.
Lesson : dropping too much voltage before the screen node is not a good idea for max "clean" power, nor for brightness.

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by kleuck
29 Apr 2013, 16:31
Forum: Amplifiers
Topic: A 3 watts KISS amp / single tube ECL82/6BM8/6F3P
Replies: 118
Views: 46150

Re: A 3 watts KISS amp / single tube ECL82/6BM8/6F3P

The 33+33 µf cap is bigger than the 100 µf one, a tight fit ! But with the Pi filter the amp is dead quiet now. http://farm9.staticflickr.com/8256/8693041784_966df68fa1_c.jpg http://farm9.staticflickr.com/8125/8691939701_747e34c143_c.jpg http://farm9.staticflickr.com/8116/8691876811_9f7b5160d2_c.jpg...
by kleuck
18 Apr 2013, 13:37
Forum: Amplifiers
Topic: A 3 watts KISS amp / single tube ECL82/6BM8/6F3P
Replies: 118
Views: 46150

Re: A 3 watts KISS amp / single tube ECL82/6BM8/6F3P

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Consistent tone and brightness all along the pot's travel now, :grin: .
by kleuck
17 Apr 2013, 13:18
Forum: Amplifiers
Topic: A 3 watts KISS amp / single tube ECL82/6BM8/6F3P
Replies: 118
Views: 46150

Re: A 3 watts KISS amp / single tube ECL82/6BM8/6F3P

Put a diode to be sure there's no interaction between cathode an pre when playing full tilt, and played with the grid-stoppers with no difference in sound actually.. http://farm9.staticflickr.com/8103/8657941652_6715a29965_c.jpg Replaced the Fet's grid resistor with a 2,2 Mohms one, to get more brig...
by kleuck
16 Apr 2013, 20:41
Forum: Amplifiers
Topic: A 3 watts KISS amp / single tube ECL82/6BM8/6F3P
Replies: 118
Views: 46150

Re: A 3 watts KISS amp / single tube ECL82/6BM8/6F3P

New video : (uploading at the time of writing)

https://youtu.be/7JwS3rLenPw
by kleuck
15 Apr 2013, 19:10
Forum: Amplifiers
Topic: A 3 watts KISS amp / single tube ECL82/6BM8/6F3P
Replies: 118
Views: 46150

Re: A 3 watts KISS amp / single tube ECL82/6BM8/6F3P

I like it too :) Love the look. http://farm9.staticflickr.com/8545/8652913808_24570b0c43_c.jpg At full tilt, the amp was still a little farty, so i replace the grid stopper from the triode for a bigger one, works. I think it can be made even higher, between 22K and 50K say. On the contrary, maybe i ...
by kleuck
15 Apr 2013, 13:17
Forum: Amplifiers
Topic: A 3 watts KISS amp / single tube ECL82/6BM8/6F3P
Replies: 118
Views: 46150

Re: A 3 watts KISS amp / single tube ECL82/6BM8/6F3P

Replaced the 600 Ohms with a 570 one (did not have a 560 on hand, best approx i could manage to do), measured the plate voltage, and dissipation is actually about 7,5 watts (huge voltage drop through the OT) http://farm9.staticflickr.com/8529/8648451773_cafa5a65a9_c.jpg I use dampers to maintain the...
by kleuck
13 Apr 2013, 15:55
Forum: Amplifiers
Topic: A 3 watts KISS amp / single tube ECL82/6BM8/6F3P
Replies: 118
Views: 46150

Re: A 3 watts KISS amp / single tube ECL82/6BM8/6F3P

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Too much compression from the triode at max gain, hence the higher grid-stopper.
by kleuck
11 Apr 2013, 15:38
Forum: Amplifiers
Topic: A 3 watts KISS amp / single tube ECL82/6BM8/6F3P
Replies: 118
Views: 46150

Re: A 3 watts KISS amp / single tube ECL82/6BM8/6F3P

Some mods after all: http://farm9.staticflickr.com/8241/8640736422_11a4725ee1_c.jpg Voltage with a Sylvania 6BM8, was high on the plate of the triode with 180K, so i came back to a 220 K resistor for a more centered bias. Plate dissipation about 7,5 watts. http://farm9.staticflickr.com/8243/86396464...
by kleuck
09 Apr 2013, 17:17
Forum: Amplifiers
Topic: A 3 watts KISS amp / single tube ECL82/6BM8/6F3P
Replies: 118
Views: 46150

Re: A 3 watts KISS amp / single tube ECL82/6BM8/6F3P

Optimized a lot of things, and it comes to an end.

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by kleuck
08 Apr 2013, 09:59
Forum: Amplifiers
Topic: A 3 watts KISS amp / single tube ECL82/6BM8/6F3P
Replies: 118
Views: 46150

Re: A 3 watts KISS amp / single tube ECL82/6BM8/6F3P

Indeed, i think i will dump the back, it's useless to me :)
Usually there is a few tubes lying in it, i think i should find a trick to secure them and leave them here all the time.
by kleuck
05 Apr 2013, 16:52
Forum: Amplifiers
Topic: A 3 watts KISS amp / single tube ECL82/6BM8/6F3P
Replies: 118
Views: 46150

Re: A 3 watts KISS amp / single tube ECL82/6BM8/6F3P

Used 1M resistors in, place of 1 Kohms...it was not working obviously.

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Actual voltages today.

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by kleuck
05 Apr 2013, 12:43
Forum: Amplifiers
Topic: A 3 watts KISS amp / single tube ECL82/6BM8/6F3P
Replies: 118
Views: 46150

Re: A 3 watts KISS amp / single tube ECL82/6BM8/6F3P

One booster/overdrive i like really is the modified DOD250 : just replace the tiny 1nf filtering cap at the output with a 10 nf one, and you end with a great blues and rock pedal, touch-sensitive and natural sounding. You MUST use a true LM741 though, it's part of the reduction in bandpass as the ga...