ECL80-Amp from Andreas Kirschner

bobo1on1 · 1st September 2005, 05:29 PM

I just stumbled across this little ECL80 amp, it looks fun to build for a first project.

However the output power seems extremely low to me, as the transformer he is using only has an input impedance of 400 ohms!
Here is the transformer datasheet.
Now I happen to have two of those transformers just sitting here on my desk collecting dust, so I might as well use them as I can buy ECL80's for €2,25 a piece but I hope it has enough power to drive more than just a pair of headphones.

Any comments?

moamps · 1st September 2005, 07:45 PM

Hi,

100V transformers usually don't have a gap in the core, which is needed to handle DC anode current in SE designs. Besides their frequency response usually doesn't meet HI-FI standards.

Regards,
Milan

bobo1on1 · 1st September 2005, 08:26 PM

Although I didn't measure the frequency response of these transformers, they do not sound bad at all when connected to a normal SS amp.
I think they should be able to handle at least 2 watts which comes down to about 60-65 mA, DC resistance is 485 ohms on the primary.

According to the datasheet, the pentode section of the ECL80 can only handle 17,5 mA but with a 400 ohm transformer that's only 60 mW or so?

1st September 2005, 05:29 PM	#1
bobo1on1 diyAudio Member Join Date: Dec 2003 Location: Tulips, windmills and wooden shoes.	ECL80-Amp from Andreas Kirschner I just stumbled across this little ECL80 amp, it looks fun to build for a first project. However the output power seems extremely low to me, as the transformer he is using only has an input impedance of 400 ohms! Here is the transformer datasheet. Now I happen to have two of those transformers just sitting here on my desk collecting dust, so I might as well use them as I can buy ECL80's for €2,25 a piece but I hope it has enough power to drive more than just a pair of headphones. Any comments?

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Need Power supply advice for Andreas 845	Rob11966	Tubes / Valves	7	12th November 2008 03:22 AM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read

1st September 2005, 07:45 PM	#2
moamps diyAudio Member Join Date: Oct 2002 Location: Croatia	Hi, 100V transformers usually don't have a gap in the core, which is needed to handle DC anode current in SE designs. Besides their frequency response usually doesn't meet HI-FI standards. Regards, Milan

1st September 2005, 08:26 PM	#3
bobo1on1 diyAudio Member Join Date: Dec 2003 Location: Tulips, windmills and wooden shoes.	Although I didn't measure the frequency response of these transformers, they do not sound bad at all when connected to a normal SS amp. I think they should be able to handle at least 2 watts which comes down to about 60-65 mA, DC resistance is 485 ohms on the primary. According to the datasheet, the pentode section of the ECL80 can only handle 17,5 mA but with a 400 ohm transformer that's only 60 mW or so?

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)