Se Opt

[cloud]

Does anyone know of a SE OTP that has a 2.5k pri and multi secondaries for headphone use ? Tap's 32 to 600 ohm

[dsavitsk]

http://electra-print.com/lineoutput.php

http://www.ecp.cc/semha.html

http://www.sowter.co.uk/headphone.htm

[Tubes4e4]

Hi cloud,

Originally posted by cloud
Does anyone know of a SE OTP that has a 2.5k pri and multi secondaries for headphone use ? Tap's 32 to 600 ohm

What would be the objective of such an arrangement? I mean, use standard SE OPT, disconnect speakers by switch, slab a suitable dummy load across the secondary (10 ohms for 8 ohms nominal sec, 4,7 ohms for 4 ohms nominal), then parallel whichever impedance headphone you want to that, be happy.

No?

Regards,

Tom

[dsavitsk]

Originally posted by Tubes4e4
be happy.

No?

No, not quite. This steals quite a lot of power from the amp. This is not a problem if you use a standard driver tube -> power tube configuration, but with a dedicated OPT with the right tap, it opens up the possibility of a simple spud amp using a 5842/437a/6c45/6688/7788, etc. I happen to like this a lot, plus it is cheaper to build in that the power supply requirements are simpler, and even custom wound OPTs can be less expensive. And, it can make a pretty good line stage too. It is still heavy, expensive, and hot, but it is less heavy, expensive, and hot.

[Tubes4e4]

Hi dsavitsk,

Originally posted by dsavitsk
No, not quite. This steals quite a lot of power from the amp. This is not a problem if you use a standard driver tube -> power tube configuration, but with a dedicated OPT with the right tap, it opens up the possibility of a simple spud amp using a 5842/437a/6c45/6688/7788, etc.

Oh, I see what you mean, I didn´t consider such small tubes.

But if you scale that only slightly, say a spud using a single trioded D3a, EL83, EL84 or something, a std 10k:4/8 ohms xfrmr plus dummy load still would be viable.

Regards, Tom

[cloud]

dsavitsk> Thank's after using your link's found what I need for under $30.00 us