6D22s wiring question

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pre65
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#1 6D22s wiring question

Post by pre65 »

Hi-i feel silly for asking this question,but given my track record on elecktrickery i will ask anyway.

On the 6D22s half wave rectifier is the output is taken from the cathode (top cap).
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#2

Post by Lee S »

Yes - For a FW rectifier connect the two cathodes (K) of two diode valves together with each AC leg of your trafo going to each diode anode (a) and CT to ground.
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#3

Post by pre65 »

Hi Lee-thanks for that.
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#4

Post by Nick »

Yes, its the other way around to most top cap rectifiers.
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#5

Post by pre65 »

Hi-does a surge limiter (thermistor) go between live and neutral ?
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#6

Post by Andrew »

As far as I recall, it should be in series with live.

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#7

Post by Lee S »

Last edited by Lee S on Thu Nov 15, 2007 1:49 pm, edited 1 time in total.
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#8

Post by pre65 »

Hi-i think Andrew is right !

Quote)
Limits the inrush current when equipment is switched on.

* Presents an initial high resistance when cold
* When heated up, the resistance quickly reduces to a negligible value
end Quote.


If across live/neutral it would not work,or if it did you would end up with a short ?
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#9

Post by Lee S »

I guess all of those web sites must be wrong then. :roll:

"Surge suppressers and protectors are available to address the problems caused by normal-mode noise. These devices are connected between the active and neutral wires at the power outlet. Most surge suppressers contain a device called a metal oxide varistor (MOV) which performs voltage suppression. A MOV is a device whose resistance value is dependent on the voltage across its terminals. A high voltage which appears across a MOV is clamped to a specified voltage and the current is diverted through the MOV and away from the sensitive computer equipment."

"Almost all shunt surge protectors rely on MOVs connected in such a way as to shunt surge energy to ground. An MOV is a type of semiconductor device which “turns on” when the voltage across it exceeds a certain value. MOVs are about the size of a quarter, and cost about a quarter. When a surge appears at the terminals of an MOV its resistance drops as the voltage across it exceeds the threshold and it conducts the surge current, diverting the surge to the neutral wire and/or the ground wire. Shunt protection is therefore diversion technology – the surge is diverted from the hot wire to the neutral wire and/or the ground wire."

Maybe you are talking about an inrush limiter Philip... What actually do you have?
Last edited by Lee S on Thu Nov 15, 2007 12:09 pm, edited 1 time in total.
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#10

Post by Nick »

I guess all of those web sites must be wrong then.
No, the sites are right, its just a MOV is not the same as a thermistor (which is what Phil said he had)

The MOV is designed to conduct when the voltage goes above a known limit, so normally its across the L and N and as the voltage is below its limit, isn't conducting. If a spike comes along, it starts conducting, and removed the spike voltage.

A thermistor, is just a resistor that varies its resistance with temperature. The one used here, has a higher resistor when cold. Its wired in series with the live connector. At startup, its cold, so its a high resistance. as current flows, the current warms it up, so its temperature increases, its resistance drops, so the current passed increases.

Wiring a thermistor acorss L and N would be a "bad thing" (tm)
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#11

Post by Lee S »

Ahhh... so that is more of an inrush limiter than a surge protector.. sorry... crossed wires there. Philip did say thermistor. Sorry chaps.
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#12

Post by pre65 »

Hi-sorry about my terminology !

Yes,it is to limit the initial surge when the amp is switched on.

Are toroidal transformers more prone to this ?
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#13

Post by Lee S »

No.. It's my fault Philip. I assumed you were talking about MOVs. I should have twigged when you said thermistor. Sorry. :oops:

Would be worth fitting a MOV anyway though. ;)
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