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First time DIY tube amp
http://diyaudioprojects.com/Forum/viewtopic.php?f=9&t=409
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Author:  CloudStrife [ 26 Jan 2009, 15:05 ]
Post subject:  First time DIY tube amp

Hello. New here. I'd like to get into tubes and spend less money, so DIY seems to be the way to go. I'd like to start with something simple that will produce a decent amount of power. I mean ~10 watts. I know it takes many tubes to produce the wattage of a less costly SS. I like the KT88 SE design. ( http://diyaudioprojects.com/Tubes/KT88/ ) It looks relatively simple, fewer parts means less money, and the KT88/EL34 should produce a nice amount of power. Are there any other design suggestions you guys recommend?

Author:  billnchristy [ 26 Jan 2009, 18:30 ]
Post subject:  Re: First time DIY tube amp

Hey Cloud, welcome over here!

I would highly recommend building a low cost kit prior to stepping into something as big as a KT88 SE amp...why? Because even though it has few parts it has a few parts that are not cheap...Look at over $200 for the transformers alone...

The 6T9 can be built for around $200 and give you a good learning experience.

Alternatively you can take it niiiice and sllloooow on the KT88.

Whatever you decide, best of luck!!

Author:  CloudStrife [ 26 Jan 2009, 18:49 ]
Post subject:  Re: First time DIY tube amp

Are you referring to the James 6123H? I saw that they are expensive, but the one's I found don't look like those in the picture. I emailed the guy who made the amp to see about this and asked if he knew of a less expensive alternative.

Author:  billnchristy [ 26 Jan 2009, 19:08 ]
Post subject:  Re: First time DIY tube amp

The top of the line Edcors are $90 a piece and if they are better than the cheapy 30 dollar ones I have then they will be spectacular.

Author:  Gio [ 26 Jan 2009, 22:07 ]
Post subject:  Re: First time DIY tube amp

There have been a lot who have been happy with that SE KT88. You will want to use good iron which will be the major cost. You can save some using EL34 and a SS power supply.

Author:  CloudStrife [ 27 Jan 2009, 16:32 ]
Post subject:  Re: First time DIY tube amp

The OT on this schematic is 5k ohm primary and 8 ohm secondary?

Image

Author:  Gio [ 27 Jan 2009, 19:32 ]
Post subject:  Re: First time DIY tube amp

CloudStrife, you will want the primary to be 5k. The secondary should match the impedance of your speakers. Another option is to get a audio output transformer that has multiple secondaries (4-8-16 ohms).

Author:  CrazzyAbtTubes [ 27 Jan 2009, 19:41 ]
Post subject:  Re: First time DIY tube amp

The Hammond units support 16, 8, and 4 ohm taps, but there SE trannies cost over $120 each! :hot:
Unless you have the money, go for it! They are capable of up to 30 watts! :up:

Author:  CloudStrife [ 27 Jan 2009, 21:04 ]
Post subject:  Re: First time DIY tube amp

Would the same OT function with the modified version of this schematic? (the one listed on the website)

Author:  Gio [ 27 Jan 2009, 21:13 ]
Post subject:  Re: First time DIY tube amp

CloudStrife wrote:
Would the same OT function with the modified version of this schematic? (the one listed on the website)

It has a tap at 43%.

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