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Something new on the bench [message #74921]

Thu, 13 December 2012 20:50

gofar99
Messages: 1947
Registered: May 2010
Location: Southern Arizona

Illuminati (5th Degree)

Hi Everyone, My latest project... A stereo integrated amp with full remote control. Class A pp u/l with up to 25 watts per channel. I do admit to cheating on the remote control section. It is modular and does all the volume, source selection and muting functions. It is the same as the one I had at LSAF in the preamp. This project is not finished yet and it probably will take me a month to get it to the level that I can post the schematics and details. A fun if not particularly inexpensive project (about $200 in trannies alone). For all you folks that can't or won't diy it, I suspect in about 6-9 months my commercial side will be issuing it as either a kit or built (maybe both). Sadly it won't be cheap there either.

Attachment: S50 angle view.jpg
(Size: 298.22KB, Downloaded 4766 times)
Attachment: S50 front view.jpg
(Size: 252.99KB, Downloaded 4757 times)

Good Listening
Bruce

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Re: Something new on the bench [message #75465 is a reply to message #74921]

Thu, 07 February 2013 14:12

gofar99
Messages: 1947
Registered: May 2010
Location: Southern Arizona

Illuminati (5th Degree)

Hi Everyone, Updated Amp Photo:

Attachment: Stereo 50 Feb 07 2013.jpg
(Size: 1.49MB, Downloaded 3972 times)

Good Listening
Bruce

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Re: Something new on the bench [message #85597 is a reply to message #75465]

Sun, 09 July 2017 18:47

WorkingWoman2017
Messages: 82
Registered: June 2017

Viscount

I am so envious of people that are electronically blessed. I am electronically challenged. This is a great example of DIY it looks very complicated. Thanks for the pictures.

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Re: Something new on the bench [message #85617 is a reply to message #85597]

Wed, 12 July 2017 15:24

gofar99
Messages: 1947
Registered: May 2010
Location: Southern Arizona

Illuminati (5th Degree)

Hi, Everyone starts somewhere. Diy is IMO a learning process. Find a simple project and preferably a mentor or at least assistant and go for it.

Good Listening
Bruce

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Re: Something new on the bench [message #85620 is a reply to message #85617]

Thu, 13 July 2017 09:21

Wayne Parham
Messages: 18783
Registered: January 2001

Illuminati (33rd Degree)

Bruce, that looks stunning! Your amps sound great too - That model is a game changer!

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Re: Something new on the bench [message #85623 is a reply to message #74921]

Thu, 13 July 2017 15:24

johnnycamp5
Messages: 354
Registered: June 2015
Location: NJ

Grand Master

Which model is that?

It looks like the "podwatt", but that's only 5watts per channel.
I'm looking to build another tube amp (kit) this winter, to power a pair of 7pi I'm building.

Perhaps I can go with some mono blocks.

Wayne, if you don't mind me asking,
which "Oddwatt" amps have you listened to with your 7pi corner horns or your 4pi's?

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Re: Something new on the bench [message #85624 is a reply to message #85623]

Thu, 13 July 2017 16:21

Wayne Parham
Messages: 18783
Registered: January 2001

Illuminati (33rd Degree)

I've run Bruce's Podwatt and Oddblock amps. The Oddblock had KT120 tubes in it.

Both are really good amps. Like you've said, the Podwatt is a relatively low-power amp, but it's enough for any models of my speakers. I still like the Oddblock better because of its ability to deliver more dynamic range. But the Podwatt will surprise you.

Bruce's amps all sound like SET amps, but they're less finicky than many of the SET amps on the market. Many SET amps have a tendency to drift as their tubes age, sometimes to the point of overheating biasing resistors and popping coupling or bypass caps. Bruce's amps don't do that.

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Re: Something new on the bench [message #85626 is a reply to message #85624]

Thu, 13 July 2017 17:02

gofar99
Messages: 1947
Registered: May 2010
Location: Southern Arizona

Illuminati (5th Degree)

Hi Folks, Thanks for the kind words. In a way it is a shame that the middle sized amps don't get more interest. The KT77/EL34/KT88 amps are quite the same in sound and have lots of punch. The nice thing about them is that you can roll all sorts of tubes. Anything in either size range can be used. The parts to build them is significantly lower as well. The difference between 28-30 watts rms and 40-42 is not going to be heard. With the smaller tubes it is 15-18 watts rms. Still plenty for most uses. The KT120 mono blocks can also use KT88/KT90 and similar tubes as well. With the present possibility of lots of bum KT120s and KT150 running around I personally would either wait for it to sort out or go for the mid size amps.

BTW I was running my system just yesterday with the mini mono blocks which are really 1/2 each of the newest Poddwatt. I have always loved the sound of EL84s and these amps don't disappoint. They are just sufficient to drive my Martin Logan ESLs to a comfortable level...I would not use them for loud rock as they don't have that level of power.

Good Listening
Bruce

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Re: Something new on the bench [message #85628 is a reply to message #74921]

Thu, 13 July 2017 18:33

johnnycamp5
Messages: 354
Registered: June 2015
Location: NJ

Grand Master

Bruce...
When you say "mid size amps" are you referring to the series 2 Octals?

Those are the mono blocks I was considering, using kt88's.
Wayne's 7pi's are 101db sensitivity, so I'm guessing that's plenty of power.

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