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Old 26th April 2008, 04:10 PM   #1
Whiting is offline Whiting  Australia
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Default Suitable Power Trans for 6gw8/6bm8/el84

Could anyone please advise if this power trans would suit for a starting point for parts to attempt to build either a 6gw8 / 6bm8 or el84 SE amp, or would it suit all and is it also suitable for 240 V mains power ?

If so which is the best way to bench test, if it is actually operative.

If more images are required please let me know, as it appears I can only attach 1 image here.

Thanks in advance.
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Old 26th April 2008, 05:24 PM   #2
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Location: Monroe Township, NJ
The trafo will not support a 6BM8 based stereoblock. The overall VA rating is way too small, sorry. For instance, the 6.3 V. winding is rated at 800 mA. You need 800 mA. per 6BM8.

Still, that chunk of "iron" could be quite useful. Notice the "universal" primary side. Set up for 230 V., unless your average mains voltage runs high, in which case you set up for 250 V. "Full wave" voltage double the 115 mA./134 V. winding. You will get approx. 30 mA. of B+, in the neighborhood of 325 V. That's good for many preamp circuits. You could rectify the 6.3 VAC winding to get a DC heater supply suitable for a phono preamp. Have you ever considered a takeoff on the "classic" passively EQed RCA design?
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Old 26th April 2008, 06:06 PM   #3
Whiting is offline Whiting  Australia
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Hi Eli.

Thanks for your reply, I guess its back to the start again.

The idea of a preamp sounds OK, however seeing as this is my 1st attempt at building an amp, I wanted to start off with a simple se amp.

You mentioned that the 6.3 V. winding is OK for one 6bm8, therefore ( & I guess you may have already answered this ) is it OK for a mono amp ?
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Old 26th April 2008, 08:49 PM   #4
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Quote:
Originally posted by Whiting
Hi Eli.

Thanks for your reply, I guess its back to the start again.

The idea of a preamp sounds OK, however seeing as this is my 1st attempt at building an amp, I wanted to start off with a simple se amp.

You mentioned that the 6.3 V. winding is OK for one 6bm8, therefore ( & I guess you may have already answered this ) is it OK for a mono amp ?

Yes, a mono 6BM8 SE amp is possible. However, it will have extremely limited utility.

FWIW, I'm involved in a project that's gathering considerable steam that uses 2X 'BM8s in a stereo "integrated" amp. The power "iron" suggested is made by Triad and works in both "120" and "240" V. zones. A number of other Aussie dudes are involved. Look here.
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Old 27th April 2008, 11:16 AM   #5
Whiting is offline Whiting  Australia
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Sounds like the very thing Id be interested in. Thanks for the link, Ill check it out.

Thanks Mate.
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