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Old 27th February 2005, 07:12 PM   #51
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OK - the 10 cent Akai transformer worked!! Came directly out of my CD into an old pair of NAD speakers and it played at a moderate volume and sounded pretty good!

Now the speakers are 4 ohm but that's all the specs I have, being a sealed box I suspect that they are not very efficient.

That leads us back to the Hammonds, before I pull them let me check (very stupid question approaching) that i really did hook them up correctly. The B+/1626 Plate connects to the BRN/BLU primary wires, the 8 ohm speakers connect to the BLK/YEL secondry wires.

I had to ask.
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Old 27th February 2005, 07:28 PM   #52
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blue=B+
brn=plate
blk=grd
yel=speaker+

are sure you have then phased the same?

try one at a time....maybe one is shorted...or wired backwards
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Old 27th February 2005, 07:28 PM   #53
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If it's in anyway meaningful I'm reading 102.1 ohms on the BRN/BLU primary & 1.7 ohms on the BLK/YEL secondary
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Old 27th February 2005, 08:34 PM   #54
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Found the problem - the banana jacks were shorting the Hammond outputs! Hahaha, who'd have thunkit?

I want to sincerely thank all you guys for the incredible help you selflessly gave in helping to tech this problem out. As I said in an earlier post, boy did I learn a lot from y'all.

Sounds pretty D-good too!
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Old 27th February 2005, 08:40 PM   #55
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Quote:
Originally posted by philipbarrett
Found the problem - the banana jacks were shorting the Hammond outputs! Hahaha, who'd have thunkit?

I want to sincerely thank all you guys for the incredible help you selflessly gave in helping to tech this problem out. As I said in an earlier post, boy did I learn a lot from y'all.

Sounds pretty D-good too!
aHA!

must isolate jacks from chassis!

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Old 27th February 2005, 10:38 PM   #56
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OK here she is, I know, I shouldn't have skipped the metalwork class!
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Old 7th March 2005, 09:09 AM   #57
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your first project? congrats!

If I were you i would stick those trans underneath the chasis, not on top.

Apart from safety issues, they look ugly naked...
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Old 7th March 2005, 02:54 PM   #58
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Your amp looks quite nice. Any chance we might get a dark shot to see the tubes a' glowing?

I've been looking at this project for a first tube amp as well... Although I'd rather do the parallel version for a little more power. How easy/hard was it to build? Do the 125ESE's actually sound pretty good? A lot of people put down the cheap iron... How's the bass? Highs? Mids?

Thanks
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Old 7th March 2005, 03:59 PM   #59
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I am really happy with the sound (& the 125ESEs) though at this point have only listened through a pair of cheapo speakers. I am particularly impressed with the stereo imaging, it really is tight. The mids & highs are very crisp & the transients are strong, it may be a little bass shy but it's hard to judge with the current set up. Certainly the bass that's there is tight & defined.

I think it's a great first build, as for the power I really don't think there's much in it. A subjective doubling of acoustic output requires a 10x power factor so you would have to build at least a 5 watt variant to really notice much difference. I am certainly experiencing no problems with speakers I suspect to be in the high 80's at best.

I am embarking on a pair of TL loaded Fostex's & will report back.

Best of luck.

Philip
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