• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Oddwatt / Oddblock Builder's Thread

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C

critical mass

Member
Joined 2010
tinitus said:
I dont know yet
either it will be wood, and I build something myself

should I use premade "steel", I would take a ModuShop from Italia
A couple of their cheaper Galaxy might work
modu
Click to expand...

I was looking at the galaxy. Bit pricey when you factor in shipping to UK. However, very nice. But the Transformer and Valve set from AE blows my budget straight away.:(

Wonder if Santa will donate to the cause:rolleyes:
 
T

tinitus

Ex-Moderator R.I.P.
Joined 2005
maybe you have looked at C-core trafos
IE-core PP cost less
but I reckon that one supply trafo and two output OPT's will be half your budget, more or less

but you could still order directly from Edcor, and save a bit
you probably wont find any at cheaper price
probably around 50-60USD for a good PP OPT

I would also be concerned about tube prices, as they will cost money in the future too

as fore the box, its probably easy to find a cheap steel box in your neighbourhood
or find something used, maybe a scrapped CD player or PC
 
C

critical mass

Member
Joined 2010
tinitus said:
Digikey.uk sells Hammond
Relatively expencive, but up to 30watt PP seems fair
more power, more money
Click to expand...

Thanks Tinitus.

Can't seem to find the correct transformers on there though :confused:
Got some specs here:

Spec A
Primary: 8kΩ A – A CT
Secondary: 0/4/8/16Ω
Rating: 25W
Style: A fully shrouded output transformer. Grain oriented (M6.35)
laminations. Flying lead termination to facilitate top chassis mounting.
: Width 80mm, depth 95mm and height 96mm

Spec B
Primary: 2 x 0/250V 50/60Hz (Series/Parallel)
Secondary 1: 180/0/180V 200mA
Secondary 2: 12.6V CT 4A
Rating: 122.4VA
Style: A fully shrouded isolation transformer with an earthed electrostatic
screen between the primary and secondary windings. Flying lead
termination to facilitate top chassis mounting.
Size: Width 96mm, depth 102mm and height 118mm
Weight: ~ 3.75kg

Could anybody tell me what part numbers these are at Digi-Key?
If not i'll send them a request for quotation.

Cheers all.
 
Last edited:
C

critical mass

Member
Joined 2010
Right.

Transformers ordered. Gonna wait on tubes till i've researched pro's and cons of different variants a bit more.

Now for the aesthetics..... I'm still trying to find a source for chassis mount transformer cans big enough to house the ones i'm using. As yet, i have had no success. Bit worried about trying to make my own.

Any ideas people?

Cheers.
 
C

critical mass

Member
Joined 2010
Could I use a cake tin to cover both transformers at once?

I know it sounds mad but I think it could be enameled and look quite nice!

The missus refuses to have even shrouded transformers in the room! I haven't explained 'exactly' how much they cost. Maybe she'll change her mind!:rolleyes::rolleyes:

So, Cake tin or does anyone know where I can lay my hands on some 100x100x100mm drawn aluminium cubes in the UK?

Cheers chaps.
 
T

tinitus

Ex-Moderator R.I.P.
Joined 2005
hmm, you have 3 trafos, OPT's and supply
with a big stereo build they are usually in line at back panel

you should be able to find some thin perforated alu sheet
I say thin because its easier to bend, and cheaper

use a piece of wood at both ends
bend the perforated metal sheet over those ends

a bit of handywork, but not too difficult
 
jmillerdoc

jmillerdoc

Member
Joined 2009
I thought the primary recommended for this amp is 5k on the OPTs, 8k will work but you will be limiting performance a bit I think. Have you already ordered the OPTs? If not and you are shipping from the USA already, I would strongly consider going with Edcor. Better price point and quality IMHO. They are what I used for this amp and I couldn't be more pleased with them. I am pretty sure they were 5k though. It has been a while.

There is a guy in the states selling chassis on eBay for 95.00, excellent quality and perfect size for this build. I had him send me a couple without the wooden ends and built my own, I think he dropped the price to 60.00 or 65.00 usd without the wood end plates, they were simple to replicate and I saved about 30%. If you are interested I will try to find the ad on bay for you, it was a little tricky to find when I looked for it again but, it is still there last I checked.
Sincerely,
Jeff
 
C

critical mass

Member
Joined 2010
Hi Jeff,

Thanks very much for your post.
Regarding Transformers, These are already ordered. :( Will the performance really be hampered significantly? Hopefully not too bad.

Re - Enclosures: I have ordered 10mm thick aluminium front panel variant Galaxy chassis from Modushop. They were not a bad price at £75 delivered for the 2 units, so i am happy there.

If there is a major issue with the Output trafos I might put them up for sale to help finance some 5k ones.

Regards,

Peter.
 
C

critical mass

Member
Joined 2010
tinitus said:
hmm, you have 3 trafos, OPT's and supply
with a big stereo build they are usually in line at back panel

you should be able to find some thin perforated alu sheet
I say thin because its easier to bend, and cheaper

use a piece of wood at both ends
bend the perforated metal sheet over those ends

a bit of handywork, but not too difficult
Click to expand...

Hi Tinitus,

I will look into this. Would prefer deep drawn cans but may have to turn my hand to sheet metal fabrication:D

Thanks for the info though.:)
 
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