My new Circlotron OTL tube power Amp.

Dimitris AR · 19th November 2011, 10:13 PM

First of all congratulatios for this great forum with those wonderful threads and ideas . I would like to introduce to you , my new tube power amplifier ( its not complete yet , but soon it will be ) , wich is an OTL Circlotron topology with the PL36 tubes . I use the following tubes for each channel , one EF184 or EF183 for the input stage / phase spliter following by one PCC85 as first differential gain stage following by two PCL82 as second differential gain stage ( the triode sections ) and the pentode sections as cathode follower to drive easely the output tubes wich is 10 PL36 five per each rail . Here is some fotos .

Dimitris AR · 19th November 2011, 10:47 PM

Two other fotos .

ke4mcl · 20th November 2011, 12:40 AM

wow! thats alot of heat!
nice build

Bigun · 20th November 2011, 01:44 AM

Impressive...

It's quite a bit of glass - can't wait to hear your impressions on how this baby sounds !

polyphaze · 20th November 2011, 01:50 AM

A truly amazing project.. I will be watching for final pics and performance comments.

Tajzmaj · 20th November 2011, 02:01 AM

Very nice ...and diy. I like it very much.
Regards, Taj

HollowState · 20th November 2011, 03:02 AM

Nice job. I like the use of the PC card as a strip line for the outputs. If you run this in or near class A I hope it doesn't oscillate on you. You may have to move the stopper resistors closer to the socket connections. Also the filaments might do a little better powered from the center tube, or even end-to-end, to equalize voltage.

banat · 20th November 2011, 07:05 AM

Very nice OTL amps project !

Best Regards !

Dimitris AR · 20th November 2011, 03:12 PM

Thank you all guys for your comments .

Dimitris AR · 20th November 2011, 03:34 PM

Quote:

Originally Posted by HollowState

Nice job. I like the use of the PC card as a strip line for the outputs. If you run this in or near class A I hope it doesn't oscillate on you. You may have to move the stopper resistors closer to the socket connections. Also the filaments might do a little better powered from the center tube, or even end-to-end, to equalize voltage.

Yes you have right , the grid stopper resistors its better to be closer to the tubes , but in this case the driver stage have very low output resistance because it is a cathode follower and will minimeze any unwanted effect . The filaments of the PL36 is 25V 0,3A for each one and the 5 tubes need 1,5 A wich is not heavy current , but i agree with you that it is better to connect it like you say if we have tubes like EL36 or El509 or other tubes wich have big reguirements of currents . In the past i use to connect every tube filaments with sepsrate cables , in this amp i do it for simplicity because there is too many tubes .

20th November 2011, 12:40 AM	#3
ke4mcl diyAudio Member Join Date: Apr 2009 Location: miami, fl	wow! thats alot of heat! nice build __________________ certified packrat

20th November 2011, 01:44 AM	#4
Bigun diyAudio Member Join Date: Jan 2009 Blog Entries: 2	Impressive... It's quite a bit of glass - can't wait to hear your impressions on how this baby sounds ! __________________ "The test of the machine is the satisfaction it gives you. There isn't any other test. If the machine produces tranquility it's right. If it disturbs you it's wrong until either the machine or your mind is changed." Robert M Pirsig.

20th November 2011, 03:02 AM	#7
HollowState diyAudio Member Join Date: Aug 2006 Location: Taxland, New Jersey	Nice job. I like the use of the PC card as a strip line for the outputs. If you run this in or near class A I hope it doesn't oscillate on you. You may have to move the stopper resistors closer to the socket connections. Also the filaments might do a little better powered from the center tube, or even end-to-end, to equalize voltage. __________________ "The supercomputer is technologically impossible. It would take all of the water that flows over Niagara Falls to cool the heat generated by the number of vacuum tubes required." ~ Professor of Electrical Engineering, New York University

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
Vacuum Tube OTL power amp!!	Matthewong	Tubes / Valves	829	20th October 2012 06:25 PM
6C33 OTL Circlotron	fdpa	Tubes / Valves	2	30th August 2011 02:20 PM
Designing an OTL / Circlotron	Dr Croubie	Tubes / Valves	32	4th July 2010 06:48 PM
6S19 Circlotron (OTL)	Fuling	Tubes / Valves	62	13th November 2008 11:16 AM
Hybrid OTL Circlotron idea	revintage	Tubes / Valves	85	3rd September 2008 12:06 AM


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

20th November 2011, 01:50 AM	#5
polyphaze diyAudio Member Join Date: Apr 2011 Location: New York	A truly amazing project.. I will be watching for final pics and performance comments.

20th November 2011, 02:01 AM	#6
Tajzmaj diyAudio Member Join Date: Mar 2011 Location: Ljubljana	Very nice ...and diy. I like it very much. Regards, Taj

20th November 2011, 07:05 AM	#8
banat diyAudio Member Join Date: Dec 2009 Location: near Belgrade	Very nice OTL amps project ! Best Regards !

20th November 2011, 03:12 PM	#9
Dimitris AR diyAudio Member Join Date: Nov 2011 Location: Athens	Thank you all guys for your comments .

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