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Old 25th Nov 2018, 11:36 am   #1
moggi1964
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Default Help finishing a valve amp build

I have been trying to build a "tube amplifier" (Tubelab SE 300b) and after multiple test - fail - repeat cycles I have simply run out of self-confidence and energy. I have had it working on the bench at one point but when I tried to put it in the enclosure then things started to go wrong.

I wanted to find someone in the North West who might be able to use their skills to finish what I started. I got support from a friend when I started building it when I was living in the US and got a lot of help from the diyaudio forum but now I needs some fresh (knowledgeable) hands on to go the last step.

4 years on...... Yup! 4 years and it still isn't on the stand playing my vinyl!

So if anyone wants to take on a new project please get in touch. I'm not expecting you to give up your time for free.
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Old 25th Nov 2018, 6:45 pm   #2
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Default Re: Help finishing a valve amp build

You are going to have to say what is wrong...multiple test repeat fails doesn't say much...it's like asking why a car won't start. Is it dead? does it partly work....in other words, what is the failure mode? It's a very simple circuit so shouldn't be too much trouble to sort out.
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Old 26th Nov 2018, 7:30 am   #3
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Default Re: Help finishing a valve amp build

Not in the North West, but willing to have a look at it for you, PM sent.

Andy.
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Old 26th Nov 2018, 7:48 pm   #4
moggi1964
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Default Re: Help finishing a valve amp build

Quote:
Originally Posted by Sideband View Post
You are going to have to say what is wrong...multiple test repeat fails doesn't say much...it's like asking why a car won't start. Is it dead? does it partly work....in other words, what is the failure mode? It's a very simple circuit so shouldn't be too much trouble to sort out.
Sideband, I didn't want to go into any detail on here otherwise I suspect it would turn into a thread of people offering helpful suggestions. I would normally be ever so helpful for any suggestions but at this point I figured the lack of detail might be the better option.

It is a constantly blowing resistor that only needs about about 50v on the variac before it starts to overheat. I have tried different values form different supplies all to no avail. I have been given some ideas form the Tubelab forum and will share all the info I have with the person I hopefully find to take on the project.

I do appreciate your contribution all the same

I have had a couple of PM's and I'll respond to them tonight.
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Old 1st Dec 2018, 12:29 pm   #5
moggi1964
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Default Re: Help finishing a valve amp build

Just to say I have arranged for my project to be reviewed with an eye to completion by a long time member on here. Hopefully it works out and of course I'll post the results.

Thanks to everyone who got in touch.
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Old 7th Dec 2018, 12:35 am   #6
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Default Re: Help finishing a valve amp build

I've dropped off my amp with member 'Ted Kendall' for him to take a look and and hopefully bring it to completion.

It'll likely be January next year before I have something to share but just wanted to say thanks again to the generous offers of assistance I received.
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Old 7th Dec 2018, 2:19 am   #7
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Default Re: Help finishing a valve amp build

Do let us know how this turns out!
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