Nick G modified Lentek Head Amp

[Marco]

Hi Nick,

Remember we were talking yesterday about you adding some components to the Lentek to reduce noise?

It was this comment of yours earlier I was referring to yesterday:

TBH, it is noisier than I would have hoped for anyway, I have a thought to try something with a couple of 2sk369 in each chan

That's what I was on about.

If the 2sk369s simply reduce noise, without affecting the sound much, then that's something I'd like to try soon - or am I misunderstanding you and that these are fitted to something else other than the Lentek?

If that's the case, is there anything you could do to the circuit in the Lentek to make it less noisy, without starting again from scratch?

Btw, I haven't listened to it yet

Marco.

[DSJR]

I left it on battery, I think it would be hard to get a low noise supply that was floating in the way a battery does.

I didnt change the transistors thats what I found under the silicon, I suspect they may be the same types BD380 (I think, the numbers were rubbed off) just different case.

I wonder if mine could be later - may explain the lack of potting compound...

I look forward to developments with interest

[lurcher]

Hi Nick,

Remember we were talking yesterday about you adding some components to the Lentek to reduce noise?

It was this comment of yours earlier I was referring to yesterday:



That's what I was on about.

If the 2sk369s simply reduce noise, without affecting the sound much, then that's something I'd like to try soon - or am I misunderstanding you and that these are fitted to something else other than the Lentek?

If that's the case, is there anything you could do to the circuit in the Lentek to make it less noisy, without starting again from scratch?

Btw, I haven't listened to it yet

Marco.

Its me not explaining whats going on in my head, sorry. I meant a new circuit, not part of the existing one. I think the Lentek is what it is, can't think of any obvious was of making it quieter.

--
Nick

[ourdogmax]

Hi Guys, does anybody have the schematic for the lentek, at all, pretty please.....

[DSJR]

I can re-post my pics to see of you can make sense of it all. You'll have to study hard to draw it out, but here goes...





The first one's pretty cr@p I admit. I'll try to dismantle it again and take a better photo of the print side...

[ourdogmax]

Thank's Dave. to be honest I can't make head or tail of it, unless it's a schematic I'm knackered.

[Reid Malenfant]

I threatened to create a schematic of the circuit previously. Just need a nice straight & clear shot of the rear of the PCB & it should be possible...

[Gerry]

I will be interested to hear your thoughts Marco.
I've had one of these for years (1983 or so) the last time I tried it can't say I was overly enamoured (it was with a 103 rather than 103R IIRC).
Anyway happy to did it out and try, I always liked the idea of active with a battery.

[nat8808]

Marco mentioned £60 on ebay - seen them go for £80 more recently.

Real shame as they would go for nearer £20 sell as recently as the beginning of the year - crazy how these things suddenly happen with the Internet <-> Ebay feedback loop.

Personally that puts them out of range for me for trying out as there are other things out there with better perceived value - the Sondex DE1 I recently sold for less than twice that is much more substantially built and with more flexiblity and importantly sounds fantastic and probably no need to do the upgrades either as it was all premium parts in the first place.

My whole recently purchased valve pre with dual volume controls and phono stage, full of Mullards was less than one Lentek battery, 4x transistor head amp. A lucky purchase perhaps (and don't yet know if it works) but just goes to show how prices become skewed.

[SquireC]

Marco mentioned £60 on ebay - seen them go for £80 more recently.

Real shame as they would go for nearer £20 sell as recently as the beginning of the year - crazy how these things suddenly happen with the Internet <-> Ebay feedback loop.

Personally that puts them out of range for me for trying out as there are other things out there with better perceived value - the Sondex DE1 I recently sold for less than twice that is much more substantially built and with more flexiblity and importantly sounds fantastic and probably no need to do the upgrades either as it was all premium parts in the first place.

My whole recently purchased valve pre with dual volume controls and phono stage, full of Mullards was less than one Lentek battery, 4x transistor head amp. A lucky purchase perhaps (and don't yet know if it works) but just goes to show how prices become skewed.

Got one here I don't use. Anyone want it for £25 plus postage?