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F5Turbo Illustrated Build Guide
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Old 28th April 2014, 04:21 PM   #21
nashbap is offline nashbap  United States
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Nicely done 6L6.

Can you tell me what is the hole size for the +, _ and speaker output wires on the board or what is the largest stranded wire AWG that can be inserted? Thanks.
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Old 6th June 2014, 02:50 PM   #22
Liliya is offline Liliya  Norway
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6L6

How the two thermistors are connected is cleary seen from your photos when the primares are divided(2x120V AC), but how should this be connected when it is 1x240V AC?

Does this thermistors have any influence on inrush problems?

Eivind Stillingen
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Old 6th June 2014, 04:29 PM   #23
AndrewT is offline AndrewT  Scotland
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one Power Thermistor to each 110/120Vac primary.

When the primaries are in parallel the 110/120Vac sees the mains supply through the resistance of one thermistor.

When the primaries are in series the 110/120Vac sees the mains supply through the resistance of one thermistor. Both primaries see twice the thermistor resistance between them and the mains.
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Old 6th June 2014, 10:53 PM   #24
Liliya is offline Liliya  Norway
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Andrew

Thanks for answering. Forgive that I need this explained with "teaspoon".
Is this what you mean? Or must another TH be added on the other side of C1?

Will the use of the thermistor influence on inrush, so I do not need a Soft Start?

Eivind Stillingen
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Old 6th June 2014, 11:11 PM   #25
Zen Mod is offline Zen Mod  Serbia
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F5Turbo Illustrated Build Guide
NTC of at least 10R

one or two in series

say one CL60 for 110Vac , two in series for 220Vac
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Old 7th June 2014, 09:28 AM   #26
AndrewT is offline AndrewT  Scotland
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The CL60 works well for 300VA to 600VA primary
If the transformer has two 300VA primaries, then two CL60 are required. One to each primary.

When the primaries are in series the CL60 are also in series.
Two CL60 now work well with 600VA to 1200VA 220/240Vac Primary.

This is the same as Zen states:
Quote:
two in series for 220Vac
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Old 7th June 2014, 09:32 AM   #27
Liliya is offline Liliya  Norway
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Thanks again. I happens to have a lot of 5 Ohm 5 A. Can I use them, eventually two 5 Ohm in series to make 10 Ohm??

Eivind Stillingen
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Old 7th June 2014, 09:48 AM   #28
AndrewT is offline AndrewT  Scotland
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For a 230Vac supply with a 1.5ohms primary winding and two 5ohms NTC in series, the peak start up current is likely to be around 230*sqrt(2)/[1.5+5+5] = 28Apk

That will need a big fuse to survive repeated start ups over a period of many months.
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Last edited by AndrewT; 7th June 2014 at 09:57 AM.
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Old 7th June 2014, 10:00 AM   #29
AndrewT is offline AndrewT  Scotland
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for a 500VA transformer with a 2A close rated fuse I'd try to find the resistance that allows reliable starting over many years.
I would use 40r to 60r of added resistance to get the start up current down to <7Apk
A T2 fuse will likely survive that repeatedly.
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Old 7th June 2014, 10:48 AM   #30
Liliya is offline Liliya  Norway
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The tranformer in this project is 500VA and a ordinary F5 that I build for a friend
(2x18v AC). So I must look for 40-60 Ohms TH? Can you suggest a suitable one.

Eivind Stillingen
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