Nick G modified Lentek Head Amp

Definitely no problem here whatsoever with lack of bass weight with either a DL-103 or EMT TSD-15 (using an adapter for the Jelco), both of which I've used with great success with the modded Lentek :)

The OC9, as you intimate, won't be the best match, so if you *really* want to hear what the Lentek is capable of, you need to obtain a DL-103, where you will discover a match truly made in heaven.....

The SPU is a no-go, quite simply because it hates the 100 Ohms loading (needing instead something around 10-20 Ohms), and as a result sounds distinctly bass-light and 'tinselly'.

One thing I've found with the Lentek is that it'll only perform at its absolute best when the battery is at its newest - and I mean newest. A few days solid use is therefore liable to reduce battery life quite considerably, even if the battery testing light is still illuminated quite brightly.

This means nada, and its sonic performance is liable to be some way off from what it was when the battery was new, with the sound being rather soft and lacking in impact in comparison. Therefore, if the Lentek is in daily use in your system, and you listen to vinyl for many hours a day, prepare to factor in the cost of between two to three batteries a month (and for best performance, they must be Duracells) to ensure that sound quality remains optimised.

Obviously this is costly, and so that's the downside. Fortunately, the Lentek/103 isn't my regular combo, so I don't go through batteries too often.

The design could really do with being powered by two 9V batteries, not just one, or via some form of external main-powered PSU. Perhaps this is something which our resident DIY-ers could look at?

Marco.

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why not try stargets ...I've found these much more musical than oscons .....I limit oscon to power supplie duties which there very goood at ..black gates are ok if you can everget them burned in [if thats the right term] ...once left off I've found they revert back .....so though stargets aren't as good ....they sound pretty good straight out the box and require little running in therefore on the whole they may sound better than none run in blackgates .

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Yep, all sorts of things could be used, but you need to consider the available space (or lack of it).

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Apologies to Nick if I appeared to leave him out

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I never noticed any sign of you doing that, no worries.

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That means nada, and sound quality is liable to be some way off from what it was when the battery was new, sounding rather soft and lacking in impact in comparison. Therefore, if the Lentek is in daily use in your system, and you listen to vinyl for many hours a day, prepare to factor in the cost of two or three batteries a month to ensure that performance remains optimised.

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Or use rechargables and leave them on charge when not in use.

Yes, Nick, that would probably work. Would it be possible though to design an external mains-powered PSU? :)

Marco.

Yes, it would,but you will need to ensure very quiet DC. could be done though. The circuit board could be removed and the whole thing put in its own case. Probbaly best to power with a wall wart type DC supply and then filter then DC from that point to be as quiet as needed.

Its a bit more than a simple supply though, it needs to float.

I think I will have a search round B&Q and look at their solar power garden lights. A good solution to make a floating supply would be 9v worth of solar cells and a bunch of LED's illuminating them.

Remember my aborted efforts with a large 12V (actually 15V) transformer and a regulated supply board? HUMMMMMMMMMMMMMM

I'm sure you're correct about battery Marco and a decent external supply may not be economical. it's probably better for Nick and others to design another circuit or use a similar one that isn't so fussy, or dedicated to a battery supply in the first place.

By the way Marco, that darned LED illuminates with less than 6V input.......

From the grave

Marco.

Piccies have vanished Marco.

Yeah, just noticed. I will look into that :)

In the meantime, the ones on Dave's post #80 should suffice: http://theartofsound.net/forum/showt...973#post197973

Marco.