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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
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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
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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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Old 3rd Jan 2019, 7:17 pm   #8
moggi1964
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Default Re: Help finishing a valve amp build

Sadly it hasn't worked out as it seems it was a bigger job than I had anticipated and therefore beyond my budget.

Guess I'll need to rethink my options.

Thanks to Ted and everyone else who responded here or on PM.

M
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Old 6th Jan 2019, 10:51 pm   #9
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Default Re: Help finishing a valve amp build

Update: found someone willing to help who has experience in the field so I dropped it off with him and we will chat later this week. I'm encouraged by what he said when he saw it so once he's given it a good look over I should have a better idea if he can get me where I need to be whilst staying closer to my budget.

Watch this space
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Old 4th Mar 2019, 4:49 pm   #10
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Default Re: Help finishing a valve amp build

Just wanted to say that my amp is now up and running and sounding wonderful.

I can highly recommend Neil Fairley at VintageVet in Leics. who did an amazing job, was frequently in touch to check things with me and his rate and warranty are very reasonable indeed.

Thanks to everyone here who offered support.
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Old 5th Mar 2019, 11:51 am   #11
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Default Re: Help finishing a valve amp build

Come on then.....

What was actually needed to make it go?
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Old 5th Mar 2019, 12:20 pm   #12
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Default Re: Help finishing a valve amp build

And here is the finished product.

Almost all the work was under the hood and at some point I'll try and grab a picture underneath. In the wide shot you can see the PT sitting separately connected via an umbilical. I over-engineered on the connectors (mil-spec) but they are secure.

Amp is a Tubelab TSE 300B
Edcor PT
James Audio OPT's and choke
Tubes are GZ34 / 5842's and 300B's.
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Old 5th Mar 2019, 3:06 pm   #13
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Default Re: Help finishing a valve amp build

...but you haven't said what the problem was.....that's more interesting to most of us than the working amp.....
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Old 5th Mar 2019, 8:45 pm   #14
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Default Re: Help finishing a valve amp build

Quote:
Originally Posted by moggi1964 View Post
Just wanted to say that my amp is now up and running and sounding wonderful.
Hey that's great news! Good to hear that.

Only... What was up with it that finally got fixed?
Nearly everyone here will be more interested in that story than the outcome, given that we're always fixing seemingly intractable things here!
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Old 5th Mar 2019, 10:06 pm   #15
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Default Re: Help finishing a valve amp build

The work was done by Neil Fairley so moggi1964 may not be in a position to describe the corrective action needed in this case.

I acquired a couple of Murphys from Neil quite a few years ago now and he is a pleasant and helpful individual. He's still a forum member (Neil F) but hasn't been active on the site for a couple of years. He can be contacted via his wesite:

http://www.vintage-vet.co.uk/

Alan
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