Nick G modified Lentek Head Amp

[Wakefield Turntables]

Thanks for the link Marco, I'll have to take mine apart and see what Nick has done to it. It would be interesting to see if he's stuck to tried and tested methods. First impressions are very promising.

[tubehunter]

Sorry about the focus, taken with my iPhone.

[Wakefield Turntables]

Very nice Duncan I'll see what I can do later tonight.

[Marco]

Lol... I think some context is needed here. The pics above are of my stock Lentek, which Duncan had to dig out (as it was potted), in order to change the output cables and phono sockets. Those are the 'before' pics. The last two are 'afters', but it doesn't show you much, in terms of the cables and phono plugs used.

There will be some component changes later, but for now, some Eichmann solid-copper RCA sockets have been fitted, along with Cardas output cables, which themselves have been fitted with solid-silver KLE Harmony plugs. Needless to say, it sounds superb, and a big improvement on what was fitted before!

Cheers, Dunc

Marco.

P.S Oh, and one other thing... This Lentek is rather different internally from ones I've had before, as it has different transistors. Perhaps an earlier or later model?

[Wakefield Turntables]

Well i tried getting into mine and Nick's done a bloody good job of making sure no-one can get in and a sneaky peak. It has been modded and from what I can see he's done the following


1. Upgrade the caps
2. Upgraded cabling to WBT
3. Internally its all silver wire (I think)
4. Silver plated female RCA's

Not sure if he's done anything to the resistors.

[lurcher]

Not intentionally, I just put it back as it was, the PCB in a plastic potting case. I replaced the tants for elna slmic II I think and the ceramic cap for a film one. I left the resistors alone as the carbon comps are not bad sounding. CMC RCA's and wiring supplied by the owner.

[337alant]

Cool, glad it works.

The bits I used were:

From www.rapidonline.com

47uF 6.3V OSCON SA Electrolytic Capacitor 4 off Part # 11-2508
47u 10V OSCON SC Electrolytic Capacitors 2 off Part # 11-2522

From www.rswww.co.uk

Radial polyprop cap,2.2nF 100V 2.5mm 2 off Part # 247-0271
Radial polyprop cap,10nF 100V 2.5mm 3 off Part # 247-0300

I don't have enough left to make up a set of all the bits, but if you can't get any of them, let me know and I will add them to the next order I send to them both for you.

The connectors used were from HiFi Collective

CMC gold plated RCA sockets one pair
CMC-1036-WF RCA plug one pair

Nick can I request a clarification
2 of the ceramics I removed measured 220pf, the other 3 measured 10nf
in your list you have 2.2nf & 10Nf
Alan

[Marco]

Hi Alan,

For a quicker answer, I'd PM Nick, as I believe he's currently taking a break from posting on the open forum, or if you get no joy there I'll give you his email address

Marco.

[337alant]

Thanks Marco and yes Nick made contact with me offline

Alan

[337alant]

Steve gave me his Lentek Head amp as it was very noisey and making a quacking noise
I also have one of these lentek MC step up amps which I used for a few years and know it well, so after looking up this tread I tought I would experiment with my unit with components that I had in the parts draws.
All I did was changed all the caps with 47uf & 10uf Nichicon KZ Muze and 22pf & 10nf Evox PFR poly prop film caps
I left all resisters and transisteors in pleece as they all measured OK
The blue tants I removed were all bad so need ed replacing
As Nick stated the PCB is potted so you have to puck all of the compound out bit by bit to reveale all the components
The bakerlite case also fell to pieces on mine so I remounted the PCB on a 0.5 sheet of PTFE and double sided foam tape.
Its a fidly job as there is not much space in this small case
I also replaced the leads with some Klotz MC500 and shark phono plugs
Resuts is a very nice sounding head amp which as stated perviously takes off the hard edge of the original tants.
I will do the same on Steves unit when I get some more parts
And maybe I will revisit mine and change all the resisters with Dale RN55d and see if there are some quieter alternatives for the BD380 transisters.
Note this will not be replaceing my Paradise phono however
Some pics

IMG_2681 by Alan Towell, on Flickr
IMG_2682 by Alan Towell, on Flickr
20160922_224227[1] by Alan Towell, on Flickr
IMG_2765 by Alan Towell, on Flickr

Alan