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Old 23rd December 2009, 02:55 PM   #11
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Old 25th December 2009, 12:43 PM   #12
Junior is offline Junior  Singapore
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Default Pwr Trasnformer (374BX vs 260M)

hi,
i had settle on the OPT (use 1629SE).
now am looking at the power transformer.
understand that Hammond 374BX is the recommended one but find that is expensive.
so am looking at its ugly cousin. based on 374BX specification, am i rite to say that 260M is the compatable one?

spec as follows:
260M - 248VA 700V C.T. @ 288ma. 5V @3A 6.3V C.T. @5A
374BX - 200VA 750V C.T. @ 201ma. 5V C.T. @3A 6.3V C.T. @6A

my question will be:
is higher VA translate to high power that the pwr transfomer can deliver? more raw power?
noted that the 260M has no CT for filament #2. is that ok?
what is the use of CT?

please do bear with me as my question may sound stupid and please do be patience with me as i am really nut about the whole built. but i am most willing to learn.
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Old 25th December 2009, 02:20 PM   #13
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Quote:
Originally Posted by Junior View Post
now am looking at the power transformer.
understand that Hammond 374BX is the recommended one but find that is expensive.
If you don't mind using another vendor, the suggested economical power transformer for the Simple SE is the Allied 6K7VG.

Allied - 6K7VG - Allied Electronics
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Old 25th December 2009, 11:30 PM   #14
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Quote:
the suggested economical power transformer for the Simple SE is the Allied 6K7VG.
The Allied is my favorite low cost transformer, but if I remember correctly Singapore has 230 Volt 50Hz power (I was there in 1988). The Allied is 115 volts only, so it will not work there.

Quote:
am i rite to say that 260M is the compatable one?....is higher VA translate to high power that the pwr transfomer can deliver? more raw power?
noted that the 260M has no CT for filament #2. is that ok?
what is the use of CT?
The 260M has a higher VA rating. This does mean that the 260M can deliver more total power than the 374BX, IF the load (the Simple SE) consumes that much power. A Simple SE with KT88's cranked to their limit should consume under 150VA so either transformer can supply enough POWER. If both transformers were constructed in the same manner the transformer with the higher VA rating should run cooler. It is well known that the Hammond 374BX runs cooler and quieter than a Hammond 274BX when both are operated on US power. This confirms that the 274 and the 374 transformers are not built the same. I don't know much about the 260 series.

The 260M has a 700volt secondary while the 374BX has a 750 volt secondary. The 260M will result in a B+ VOLTAGE that is about 35 volts lower than with the 374BX. This will result in reduced power output. The higher (6.5K) load already chosen tends to favor a higher B+, so I would look for a 750 VCT (or 375-0-375) transformer.

The center tap (CT) is not used on the Simple SE, so it is not required. If the transformer has a CT it is simply not used.
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