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I am considering a MagneQuest Robin Hood SE OPT for my Mullard 3-3 circuit as an upgrade from Hammond 125ESE.
Has anyone heard one of these OPT's in a typical SE 6AQ5/6BQ5 circuit?
Would it be a considerable upgrade from 125ESE?
maldar
Hammond says the 125ESE has 9.58 henries of inductance. Mike says the RH gapped for 60mA has 30 henries of inductance. I say, 20 henries is the minimum for acceptable hifi bass at a 5K impedance level. More inductance is better.
Given Mike's approach to materials and construction, I would expect better sounding treble as well. I have not, however, actually listened to any of these particular transformers.
Thanks for the offer. I can't send you email here b/c it won't recognize my email address, so I can't log in and change my settings.
Just trying to get some feedback from people on what some decent OPT's for my kind of low-power circuits might be.
Why don't you try selling the RH-80's on EBay?
maldar
I looked at your circuit, and a 5k transformer gapped for 50ma fits the bill. This is between two Robin Hood transformers, but Mikey surely can gap it for your application.
I did also forget to mention that the RH transformers are small and in channel frames. I know this has bothered a person here and there in the past, but for a 3 watt amplifier, size is pretty immaterial.
I haven't heard them, but had bought RH-80's for instrument amp projects
at the time over Hammonds. Too many projects later and they are still
here. Mike's ratings are generally conservative for the great work he
puts out.I have 4 spare (NIB) RH-80's here. Drop me an email offline if you
want to look at some. Couldn't send you "unsolicted email" and don't
mean to dis-respect the forum in any way.Andrew
Edits: 06/28/09 06/28/09
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