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Old 9th May 2009, 09:21 PM   #1
newtube is offline newtube  United Kingdom
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Default Tubelab sse transformer wires

Guys, i need some help. . .

I have the hammond 373bx mains transformer and need to know what to do with the wires. . .
This is what they say to connect for 240v which we use in the uk, but what do i do with the white wire? is that the neutral?
http://www.hammondmfg.com/300series.htm

And i have these output trans-

Click the image to open in full size.

on the left it has 2 wires, blue says"p" red says "b" what are they for?
on the right i have one that says 8, one says 4 and one has 2 wires saying 0, are these numbered for ohms, ie i have 8ohm speakers so i use the 8? but what do i do with the 2 wires that have 0 on them?
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Old 9th May 2009, 10:49 PM   #2
w5jag is offline w5jag  United States
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That looks like a push-pull output transformer.

If so, red is the center tapped B+ lead, the two blue leads are for each plate (anode) of a push-pull pair.

A push-pull transformer won't work in a single ended amplifier like the Simple SE.

Win W5JAG
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Old 9th May 2009, 11:05 PM   #3
newtube is offline newtube  United Kingdom
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They are from a 300b se mate, so not push-pull.
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Old 9th May 2009, 11:21 PM   #4
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If you scroll down your link, it shows the hookup for 240V.

Careful. Electricity can make you cuss.
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Old 10th May 2009, 01:52 AM   #5
Funker is offline Funker  Germany
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Hi Newtube,

mainstrafo: follow ethermions hint , for 240V connection : white is neutral, blue is live, and brown and black must tied to each other. All other leads shoud be carefully isolated with insolation tape. Insert a 3 Amp fuse in your mains plug.

Your output trafo seem to be a single ended one. The blue and red ones are belongs to the primary. p say connect it to the plate of the output valve. And b say connect it to the +supply voltage .
If you want to play with an 8 ohm speaker, connect the speaker between 8 Ohms and 0 Ohms.

Please donīt haggle with the mains voltage unless you know exactly what you do. It is no warning, just a smack which finally put you out of the match. If you are in doubt, ask quilified skilled persons for help.

regards from Hamburg
Wolfgang
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Old 12th May 2009, 08:52 AM   #6
newtube is offline newtube  United Kingdom
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Thanks for that funker

Just one more thing, i know which wires which now, so all i need to know is which point on the simplese board to connect them, ie which is the plate connection and which is the supply voltage connection?

This is the one i'm wiring up-

Click the image to open in full size.

There are 2, 3pin terminals for the output transformer connections on the board, which which connection point is for which wire?

Thanks again guys.
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Old 12th May 2009, 01:44 PM   #7
newtube is offline newtube  United Kingdom
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Anyone? please! i'm hoping to fire it up later today and want to be sure i connect the transformers to the correct points on the board.

Cheers.
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Old 12th May 2009, 02:21 PM   #8
chrish is offline chrish  Australia
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The colours Tubelab uses are "standard" colours as used in Hammond transformers. Look at the colours and compare to the Hammond output transformers http://www.hammondmfg.com/1608.htm
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Old 12th May 2009, 02:22 PM   #9
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It looks like your output transformers have standard colors on the wires that match the colors on the wiring diagram. In this case the 3 pin connectors get wired exactly as shown (same colors). As stated red is B+ and blue is the plate.

The only thing that is not obvious in your picture is which color secondary wires are which impedance, but they do not connect to the board, so choose the secondary that matches your speakers.
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Old 12th May 2009, 02:29 PM   #10
newtube is offline newtube  United Kingdom
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Thanks your a star.
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