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Old 4th February 2006, 04:50 PM   #1
5u4 is offline 5u4  United States
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Default Loftin-White

I've recently completed a Fi-Primer Loftin-White. Tubes are Sovtek. OPT's are Transcendar I got from e-bay; they seem to be exellent. Power transformer & choke are custom Electra-Print. I used Shottky Cree doides & later added a standby switch as turn on surge went above 500V. Voltages are within +5% except for the driver which I need to bring down some. Sound is very neutral with extended lows & highs. There's no euphonic mids, soggy bass & rolled off highs one might expect from a SE amp. Micro detail is very well defined, easily revealing double tracked vocals, ect. It's also easily driven by a CD player/passive preamp. This is my third major project, the first being a SE amp using a Svetlana 811-10. The L-W is much better sounding. The second was a EL-509 OTL which is a very nice sounding amp, but doubles a s a space heater. So far I'm very impressed with this amp. Let me know what you think.
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Old 4th February 2006, 05:15 PM   #2
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Very Nice!
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Old 5th February 2006, 02:11 PM   #3
5u4 is offline 5u4  United States
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And the underside.
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Old 5th February 2006, 02:23 PM   #4
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Exceptionally clean construction inside. Nice job!
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Old 5th February 2006, 06:36 PM   #5
kevinkr is offline kevinkr  United States
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Super nice! I bet it sounds really good too.. I googled transcendar the other day, are their prices competitive or expensive?
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Old 5th February 2006, 11:52 PM   #6
5u4 is offline 5u4  United States
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Thanks, I really like the sound of this amp. It easily drives my 90db speakers in a small room. I think the circuit designer got it right.

I found the Transcendar OPT's on e-bay by searching for "300b" There's a pair for sale every couple weeks or so. The price is on the low side & a good value. They are made in California, 3K pri., 100ma., 8 & 4 ohm sec. I measure around 268 ohm pri. dcr & they are very well matched. They have black cloth cemented around M6 lams & 18g teflon leads. Interleaving on pri. & sec.
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Old 6th February 2006, 01:11 AM   #7
kmtang is offline kmtang  Canada
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Hi 5U4,

What is the driver tube you are using?


Johnny
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Old 6th February 2006, 08:28 AM   #8
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Very nice

I especially like the inside!

cheers
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Old 6th February 2006, 08:45 AM   #9
5u4 is offline 5u4  United States
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Sovtek 6SL7 SRPP.
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Old 6th February 2006, 03:49 PM   #10
5u4 is offline 5u4  United States
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Thanks, everything has its own ground wire & is star grounded to a screw near the input, except power transformer CT & C1 share a ground. For the most part signal is in one bundle & PS is in another bundle. Don't know if this is the best way to do it or not, but it works & notice no problems. The amp is very quiet & channel seperation is very good.
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