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I am a little confused with the wiring between the Power, Fuse, Power Transformer & Switch.

Also is there a polarity with the two black wires of the PT - How do I tell?Most PTs I have a black wire and a few different color wires.

Are there any clear photos that can be posted of those areas wired?

Thanks:

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ROB

The PT has no polarity or phasing on its windings. When you have different colours, they are purely there to indicate different voltage windings. The Triwatt PT only has a single 120V primary (or 230V for overseas). So you just need to wire the IEC connector, switch, and fuse in series with the PT primary's black wires.

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Great tones come in small glass jars!

I was talking with a co-worker. We were discussing if the position in the switch in the circuit matters with AC Circuits. With DC Circuits we had burn out problems on high amperage circuits.

Would puting the switch before or after the PT, be better or worse.

Thanks:

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ROB

Before the PT is the power switch. AC

After the PT is the standby switch. DC

Just use a good quality switch (I like Carling) and you'll have no issues with switches failing.

Switch is a min of 10A rating. I think for safety reasons, you should have the power switch before the transformer.

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Stephen
Web: www.trinityamps.com. Facebook: facebook.com/trinityamps. Twitter: @trinityamps

Definitely before the transformer! And also fuse the hot side of the IEC.

I believe that this is actually a UL requirement that the power be switched, fused and chassis grounded within 3" of entry...

Joe G

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Some assembly required,
Brain sold separately...

In that case 90% of all guitar amps would be in violation of UL, if the power switch had to be within 3" of the entry point, given that the entry point would normally be on the rear and the power switch on the front panel. So would a lot of other kinds of electronics equipment.

_________________
Great tones come in small glass jars!

Absolutely, and ONLY mains goes to that ground, not other amp grounds or parts and lock/star washers too. We use #8 screws and lock washers.

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Stephen
Web: www.trinityamps.com. Facebook: facebook.com/trinityamps. Twitter: @trinityamps

You're right Phil, fused and grounded, but not switched
Around here we use switched, fused and filtered entry modules for everything, but it's not a requirement.

As a side note... It's not likely that a tube amp design from the 50's or 60's would pass today's standards anyway

Joe G

_________________
Some assembly required,
Brain sold separately...

No kidding - 2 prong plus with no grounding!!

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Stephen
Web: www.trinityamps.com. Facebook: facebook.com/trinityamps. Twitter: @trinityamps

Man those things must have some major hum.

Do most people that play vintage amps add a 3 prong?

I'm thinking that even the repro's we build wouldn't make UL without the proper warning labels. And then there's the EMI/RFI emission requirements... Forget about it
I don't miss the old "polarity" switch days. Nothing like standing up to the mic and getting what seemed like a million volts through your lips

Joe G

_________________
Some assembly required,
Brain sold separately...

Speaking of guitar amps violating electronic safety stuff and what not.

Isn't using a PT bolt as a ground point using a terminal ring a big no no?

It isn't typically an issue using existing bolts for ground points (it depends on the conditions and the customer requirements in my case), but if you had to I would surround the lug with either internal or external tooth lock washers on each side and get the lug's ring as close to the chassis in the hardware stack as you can... So chassis/lock/lug/lock flat/lock/nut or nyloc.

Joe G

_________________
Some assembly required,
Brain sold separately...

Code Says Not to connect anything else but the ground lug to the mains ground.

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Stephen
Web: www.trinityamps.com. Facebook: facebook.com/trinityamps. Twitter: @trinityamps

Does this one help at all...?



The blue wire is essentially an extension of one of the PT primary's black leads.

On the Progressive switch, the Standby switch is the two lugs on the Right. The Power switch is the two lugs on the Left.

HTH

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Great tones come in small glass jars!

I see why I was going nuts. My IEC was 180 degrees in the other direction. Looks like I should trust the Triwatt Layout Drawing over all else.

Thanks:

P.S. I now have all parts needed to complete the amp. My Monster Cable Combo Speaker Cable came yesterday.

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ROB

Back in the early 80s I needed to do that with an Ampeg V4 I had. Lots on hum.

Loved the amp, hated the weight & the 11 tubes. Much happier with 5 or 6 tubes (cost wise), besides I thought my friend Model 1986 Marshall Bass Head sounded better.

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ROB