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Sergelac
 Post subject: Back after ten years
PostPosted: Sat Jan 25, 2020 4:45 pm 
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Joined: Wed Sep 09, 2009 7:41 pm
Posts: 57
Location: Joliette, Québec, CA
Back after ten years,

Yep! started that triwatt after having built a 18 watts and an Tramp and stopped for lack of interest i supposed. So after all these years tinkering with arduinos, programming, and astronomy, i'm ready to complete my triwatt.

So I did complete it but i must now seek for the help of some masters since i must confess I'm far from an expert in this domain.

1. In the schematic it seems that the wire coming from the impedance switch 16 ohms lug isn't connected to the secondary. I suppose it is only an omission, but the newer schematic is the same regarding this issue. And, is it normal that the presence circuit is only connected to the 16 ohms impedance lug ? Does it work with 8 or 4 ohms load ?

2. After having reversed the output transformer primary brown blue wires my amp is now much quieter. But even with the bias pot fully anticlockwise i got a reading of 150mv. In fact the pot doesn't seem do to anything regarding the bias???
Any idea ?

Thank for your help and sorry for my poor english.

And for posting a picture which hosting service do you used ?

Serge
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Hankules
 Post subject: Re: Back after ten years
PostPosted: Sat Jan 25, 2020 5:51 pm 
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Joined: Wed Sep 12, 2018 5:17 pm
Posts: 374
Location: Shawnee, OK
Not having built a Triwatt, my general suggestions would be to download the current schematic and layout, the layout is your friend. With regards to the bias reading, make sure that you have the bias switch (for 6V6 and KT66) power tubes in the correct position. I have been reading the Triwatt forum back to front (considering it for my next build) and several experienced builders had problems with setting bias only to realize the bias switch was set in the wrong position for the installed power tubes or wired incorrectly. Also mentioned, lot of people missed jumper connections and the usual bad solder connections (been there, done that). Someone else with more experience will, I hope, address your specific questions. Best of luck :thumbsup: , I see from other posts that it is an awesome amp :!: PS Welcome back :D

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Davidmenk3
 Post subject: Re: Back after ten years
PostPosted: Mon May 06, 2024 8:40 am 
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Joined: Mon May 06, 2024 8:21 am
Posts: 2
Sergelac wrote:
Back after ten years,

Yep! started that triwatt after having built a 18 watts and an Tramp and stopped for lack of interest i supposed. So after all these years tinkering with arduinos, programming, and astronomy, i'm ready to complete my triwatt.

So I did complete it but i must now seek for the help of some masters since i must confess I'm far from an expert in this domain.

1. In the schematic it seems that the wire coming from the impedance switch 16 ohms lug isn't connected to the secondary. I suppose it is only an omission, but the newer schematic is the same regarding this issue. And, is it normal that the presence circuit is only connected to the 16 ohms impedance lug ? Does it work with 8 or 4 ohms load ?

2. After having reversed the output transformer primary brown blue wires my amp is now much quieter. But even with the bias pot fully anticlockwise i got a reading of 150mv. In fact the pot doesn't seem do to anything regarding the bias???
Any idea ?

Thank for your help and sorry for my poor english.

And for posting a picture which hosting service do you used ?

Serge


Hey Serge,

Welcome back to the world of DIY amp building! It sounds like you're diving back in with some interesting projects.

Regarding your questions:

It seems like there might be an oversight in the schematic, as you suspected. The presence circuit should ideally be connected to all impedance lugs, not just the 16-ohm one. As for whether it works with 8 or 4 ohms load, it's best to consult with someone more experienced in amp design for specific guidance.
It's strange that the bias pot isn't having any effect on the bias readings, even when fully anticlockwise. It could be a wiring issue or a problem with the pot itself. I'd recommend seeking advice from experienced amp builders who might have encountered similar issues.
As for hosting services for posting pictures, you might want to check out HostNoc. They offer cheap virtual private server solutions that could suit your needs.

Best of luck with your amp project, and don't worry about your English – you're doing just fine!

Cheers!
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otis
 Post subject: Re: Back after ten years
PostPosted: Sun May 12, 2024 9:41 pm 
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Joined: Tue Jan 03, 2023 11:16 pm
Posts: 9
Sergelac wrote:
Back after ten years,

Yep! started that triwatt after having built a 18 watts and an Tramp and stopped for lack of interest i supposed. So after all these years tinkering with arduinos, programming, and astronomy, i'm ready to complete my triwatt.

So I did complete it but i must now seek for the help of some masters since i must confess I'm far from an expert in this domain.

1. In the schematic it seems that the wire coming from the impedance switch 16 ohms lug isn't connected to the secondary. I suppose it is only strands nyt an omission, but the newer schematic is the same regarding this issue. And, is it normal that the presence circuit is only connected to the 16 ohms impedance lug ? Does it work with 8 or 4 ohms load ?

2. After having reversed the output transformer primary brown blue wires my amp is now much quieter. But even with the bias pot fully anticlockwise i got a reading of 150mv. In fact the pot doesn't seem do to anything regarding the bias???
Any idea ?

Thank for your help and sorry for my poor english.

And for posting a picture which hosting service do you used ?

Serge

It's possible that the connection from the impedance switch's 16-ohm lug to the secondary is indeed missing from the schematic. Typically, the presence circuit is connected to the highest impedance tap on the output transformer, which is often the 16-ohm tap.
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lanaderay
 Post subject: Re: Back after ten years
PostPosted: Mon Jul 29, 2024 12:40 am 
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Joined: Sun Jul 28, 2024 11:28 pm
Posts: 1
otis wrote:
Sergelac wrote:
Back after ten years,

Yep! started that triwatt after having built a 18 watts and an Tramp and stopped for lack of interest i supposed. So after all these years tinkering with arduinos, programming, and astronomy, i'm ready to complete my triwatt.

So I did complete it but i must now seek for the help of some masters since i must confess I'm far from an expert in this domain.

1. In the schematic it seems that the wire coming from the impedance switch 16 ohms lug isn't connected to the secondary. I suppose it is only strands nyt an omission, but the newer schematic is the same regarding this issue. And, is it normal that the presence circuit is only connected to the 16 ohms impedance lug ? Does it work with 8 or 4 ohms load ?
bou's revenge free.
2. After having reversed the output transformer primary brown blue wires my amp is now much quieter. But even with the bias pot fully anticlockwise i got a reading of 150mv. In fact the pot doesn't seem do to anything regarding the bias???
Any idea ?

Thank for your help and sorry for my poor english.

And for posting a picture which hosting service do you used ?

Serge

It's possible that the connection from the impedance switch's 16-ohm lug to the secondary is indeed missing from the schematic. Typically, the presence circuit is connected to the highest impedance tap on the output transformer, which is often the 16-ohm tap.
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