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Old 30th December 2005, 09:20 PM   #1
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Default A small no-fuss pentode/pentode SE amp

Gentlemen,

here is another project I completed:

http://www.tubes.mynetcologne.de/roe...e/6v6se_e.html

It was intended as a birthday present for a friend to be used in a small room with small bookshelf speakers.

It is a small 4,5 Watt/channel pentode/pentode single ended integrated which gives a damn on all this "single ended triode without any negative feedback" madness.

Instead, it is a no-fuss, well-engineered, solid all-pentode circuit amp, which simply does what it is expected to do.

If you are interested in the circuit development process, you can find it described extensively in the form of a moderate level walkthrough, starting at:

http://www.tubes.mynetcologne.de/roe...ematics_e.html

May this walkthrough help other tube DIY amp enthusiasts construct and enjoy their own "no fuss" amps and bring back a wee bit of solid engineering in this world of audiophool madness.

I would like to thank the crowd at "The G33k Zone" http://geek.scorpiorising.ca/GeeK_ZonE/index.php who helped a lot in making the schematics section walkthrough come true.

I wish you and your relatives a great new year!

Tom
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Old 30th December 2005, 11:20 PM   #2
Giaime is offline Giaime  Italy
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Beautiful construction!

How much NFB to bring the DF down? And what OTs are you using?
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Old 31st December 2005, 08:45 AM   #3
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Hi Giaime,

Quote:
Originally posted by Giaime
How much NFB to bring the DF down?
13,5 dB, see this chapter.

Quote:
And what OTs are you using?
Reinhöfer 53.70, see this chapter.

Tom
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Old 31st December 2005, 10:36 AM   #4
Giaime is offline Giaime  Italy
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Are the OT avabile on the Net or are them from a local manufacturer? They seem interesting, with all those primary connections... And I assume they're pretty cheap.
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Old 31st December 2005, 11:12 AM   #5
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Hi Giaime,

Quote:
Originally posted by Giaime
Are the OT avabile on the Net or are them from a local manufacturer? They seem interesting, with all those primary connections... And I assume they're pretty cheap.
They are from Gerd Reinhöfer, a German winder. His site can be found here:

www.roehrentechnik.de

The ones being used in this project are intended for "experimentation", therefore all the taps.

Although experimentation types, they perform well enough to have made it into this amp finally.

Tom
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Old 31st December 2005, 11:21 AM   #6
Cassiel is online now Cassiel  Libya
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Quote:
May this walkthrough help other tube DIY amp enthusiasts
Sure.
Great work Tubes
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Old 31st December 2005, 12:06 PM   #7
jane is offline jane  Norway
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Always a pleasure to read well documented projects. And the documentation for this one was in category A+.

Well done, Tubes4e4!
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Old 31st December 2005, 01:05 PM   #8
Giaime is offline Giaime  Italy
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It is indeed very well documented, but very simple to understand.

I propose this as an "ufficial" walkthrought
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Old 31st December 2005, 06:32 PM   #9
kopite is offline kopite  New Zealand
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Hi Tom, you have a great website, very informative with lots of useful information. I go there a lot.
Where do you get the mounting boards for the components please?
Thanks.

Phil.
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Old 31st December 2005, 08:30 PM   #10
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Hi Phil,

Quote:
Originally posted by kopite
Where do you get the mounting boards for the components please?
Those solder tag strips are still available at local electronic components shops over here in Germany - they still are in production.

Also, they are available at any well sorted E-parts mail order company here in Germany, called "Lötleisten" over here.

There are many web shops for DIY guitar amp gear that stock them, too.

I like them - they allow a components placing and wiring technique somewhere in the middle between the extremes of PCBs and pure point-to-point wiring.

Tom
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