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Old 15th November 2012, 04:57 PM   #1291
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Default BH PSU

Quote:
Originally Posted by gingertube View Post
Ian,
Here is a power supply, a bit over the top maybe but adjust to your taste.
Ian , Thanks very much for that, just what I wanted, and thanks for the explanations for the various components. invaluable for a complete novice......I'll keep everything as you suggest and give it a go.
Bit busy with other stuff at the moment. I'll let you know how it goes in due course.

Ian.

Last edited by sharkey22; 15th November 2012 at 05:00 PM.
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Old 16th November 2012, 07:20 AM   #1292
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Just a quick report on progress....

I've designed the chassis in solid works and had it laser cut then folded and welded at a local shop. I've just got it back from the paint shop this afternoon and fitted a few parts to see what it's going to look like....

I've never tried to attach files before so I hope they show!
Attached Images
File Type: jpg chasis5sm.jpg (154.5 KB, 433 views)
File Type: jpg chasis2sm.jpg (221.4 KB, 409 views)
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Old 16th November 2012, 10:47 AM   #1293
stajo is offline stajo  Sweden
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That looks super Drewaudio! Are you going for an octal version or am I a bad counter?

best
Staffan
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Old 16th November 2012, 05:46 PM   #1294
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Thanks! The plan is to build the octal version as I've got a box full of 6v6s but I've also got a few 6f6's in the st shape that I'd like to use.

The first problem is that I was told to allow 80 to 100 microns for the paint thickness inside all the holes. The reality is that the paint thickness is mo like 200 microns inside the holes which makes a planned 5.2mm dia hole into a 4.8mm dia hole
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Old 16th November 2012, 05:58 PM   #1295
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Drewaudio, to accomodate for the folds, did you have to add length to each side to allow it to be bent?
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Old 16th November 2012, 06:55 PM   #1296
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Hi Gokite,

The particular version of solid works was from the local metal shop and calibrated for their folding machine and press. All I did was draw the chassis with the finished dimensions (eg external height, length, width) and hole shape/locations based on a sheet of 2mm aluminium and the software 'allowed' for the bends etc.

I've attached a 3D pdf output from the software that you can spin around. You will see that I've also set the bottom cover in by 2mm too.

The solid works file was then sent to a laser cutter before coming back to the shop to be bent in the press and then hand welded.

The cost will be about $160USD for the box which is not too bad considering that freight to New Zealand is a killer for any imported chassis. At least I get exactly what I want in terms of size, shape etc and I get a chassis with a decent wall thickness and all the holes pre-cut.
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File Type: pdf box.PDF (193.2 KB, 76 views)
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Old 21st November 2012, 07:45 PM   #1297
JUracan is offline JUracan  Spain
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Hi everyone!

I am new to this forum. I found this while searching for a simple tube amp. This project seems great for a starter like me.

I do have some notions in electricity and electronics but I've never worked with tubes before. I am looking for some guidance too. I have a few questions regarding the building of this amp:

-What kind/brand of transformers work good with tubes? I am looking for some simple ones, I need them to be shipped to Europe (Spain) too. Anyone can help?
-Lurking around the thread I have realized that, eventhought you all are building the same amp, some people use fewer tubes. If I understand the diagram right, you need 4 tubes to build a mono amp right? That would make 8 tubes for stereo...is that right or am I missing something?
-Is it completely necessary to mount the tubes on the ceramic holders? I don't know where to get those from.


I'm hoping for your answer,

JUracan
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Old 21st November 2012, 08:05 PM   #1298
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Hi JUracan,

You would need 3 tubes per channel (2x EL84 and 1x ECC803). Some might use only one half of the double-triode ECC803 but two each (for some layout reasons or something else) - that's why you counted 4 per channel?

I only used Hammonds 1608 so far in mine and are quite pleased. The amp works already great with simple output transformers.
I will eventually upgrade the transformers with something better but at the moment the amp is my main system and I cannot afford to take it apart.
I bought the Hammonds while I was still living in NYC but I am sure you can buy them in Europe, too.
There are several forum members from Spain here, so I am confident they will give you good advice where to get decent transformers more locally and maybe even the ceramic tube sockets.
In Europe there are several good choices of transformers vendors; I get mine from Gerd Reinhöfer (Reinhoefer Electronic) recently, and the quality and performance is outstanding for that price.

Cheers,
Martin
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Old 21st November 2012, 09:39 PM   #1299
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Hi JUracan,

Welcome to the forum.

If I had to build this amp again from scratch I would pick up an old push pull amp that used EL84s ( 6BQ5s) as output tubes. You will get most of the parts that you need such as mains transformer, sockets, valves etc. You might get a pair of ECC83s (12ax7) that can be used instead of the ECC803S.

Another possible donor amp would be one that uses four ECL86's. Ian has posted a Baby Huey schematic earlier on in the thread that suits the ECL86.

Output transformers might still be a problem as this design requires the output transformers to have ultra linear taps.

Quote:
-Is it completely necessary to mount the tubes on the ceramic holders? I don't know where to get those from.

If the question is " are sockets required " then for a new builder the answer is yes. Ceramic sockets I think are a matter of taste. A lot depends on quality. I bought new ceramic sockets for my first build but was very disappointed. I replaced them with much better teflon sockets pulled from ex military equipment.



HTH Bill
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Last edited by Soonerorlater; 21st November 2012 at 10:02 PM.
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Old 23rd November 2012, 12:15 PM   #1300
JUracan is offline JUracan  Spain
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Thanks bayermar!

I'm not even sure about what kind of transformers I actually need. Are they normal trafos? I just need one with that output and that's it?


Quote:
Originally Posted by Soonerorlater View Post
Hi JUracan,

Welcome to the forum.

If I had to build this amp again from scratch I would pick up an old push pull amp that used EL84s ( 6BQ5s) as output tubes. You will get most of the parts that you need such as mains transformer, sockets, valves etc. You might get a pair of ECC83s (12ax7) that can be used instead of the ECC803S.

Another possible donor amp would be one that uses four ECL86's. Ian has posted a Baby Huey schematic earlier on in the thread that suits the ECL86.

Output transformers might still be a problem as this design requires the output transformers to have ultra linear taps.

If the question is " are sockets required " then for a new builder the answer is yes. Ceramic sockets I think are a matter of taste. A lot depends on quality. I bought new ceramic sockets for my first build but was very disappointed. I replaced them with much better teflon sockets pulled from ex military equipment.

HTH Bill
I had that same question, so you are telling me that ECC83s are compatible with ECC803S? Will I notice any difference in the sound? I have seen ECC83s pretty cheap, but the 803 cost quite a lot (compared to the other).

Where do you guys buy all this old amp stuff? Ebay? I take a look there from time to time, but most of them won't ship to Spain...

Why were you dissapointed with ceramic sockets? The first ones you got were bad quality/bad finishing on them?


I have other questions too, do I need to build it in a metal chasis or can I build it anywhere? I don't know if the chasis acts as a Faraday cage or it's just for looks.
Are all 9-pin sockets the same or do they have differences from tube to tube?
What would happen if you hook a electric guitar to this amp? Would it sound right or is it too linear? I'm not to much of a fan of distortion in guitars, will iI mainly want it to play music, but I might want to try connect my guitar.

What kind of output should I use? How many efficiency dB is just right?

I have another tonn of question regarding the best components to use (resistor/capacitor/etc wise).

Sorry if I am too n00b, I just got here.

Thanks for all the replies!
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