Nick G modified Lentek Head Amp

[Paul Hynes]

Hi Jez,

The ZTX’s maintain decent Hfe in the circuit with standard values with a quiescent current in the region of 250 microamps so they are a good choice for this circuit electrically. I have used these devices since they were first introduced because of their linear Hfe characteristics. I cannot comment on sound quality in the Lentek circuit until I have some listening time under my belt probably around springtime. Although if I get chance to sneak into the workshop over Xmas I may do a quick hardwire job for a first impression as the low component count makes this easy enough.

Incidentally Jez, I was not considering offering boards or modules using this circuit when I said I would get some boards made. This is purely to make life easy for component comparisons as a fun personal project in the spirit of the forum ethos and I am happy to disclose any interesting findings as the project progresses.

[Arkless Electronics]

Hi Jez,

The ZTX’s maintain decent Hfe in the circuit with standard values with a quiescent current in the region of 250 microamps so they are a good choice for this circuit electrically. I have used these devices since they were first introduced because of their linear Hfe characteristics. I cannot comment on sound quality in the Lentek circuit until I have some listening time under my belt probably around springtime. Although if I get chance to sneak into the workshop over Xmas I may do a quick hardwire job for a first impression as the low component count makes this easy enough.

Incidentally Jez, I was not considering offering boards or modules using this circuit when I said I would get some boards made. This is purely to make life easy for component comparisons as a fun personal project in the spirit of the forum ethos and I am happy to disclose any interesting findings as the project progresses.

Same here... useful devices for a wide range of applications.. I remember when they were Ferranti... and it were all trees round here you know

I have no issues if you had been planning to offer boards... the designs in the public domain My offer to do so earlier in the thread is merely me thinking maybe I can make a wee bit of money here and there from it if there is more demand for Lentek head amps than available ones.... If, as I suspect, people won't pay more for a new one than for a second hand one (nowt as queer as folk..) it will go nowhere...

I have my very low noise test gear on the bench ATM anyway as I'm building one of my FET head amps (up market one, not the budget one) for a customer, so I will probably knock up a Lentek this end as well... and knowing me it will end up a "souped up" one...

[anthonyTD]

I also chose Transistors from the ZTX range, to use in a low voltage, low noise, temperature compensating, voltage refrence, for the Soul series, good devices.
Good luck with the developement/testing Paul, Jez.

Hi Jez,

The ZTX’s maintain decent Hfe in the circuit with standard values with a quiescent current in the region of 250 microamps so they are a good choice for this circuit electrically. I have used these devices since they were first introduced because of their linear Hfe characteristics. I cannot comment on sound quality in the Lentek circuit until I have some listening time under my belt probably around springtime. Although if I get chance to sneak into the workshop over Xmas I may do a quick hardwire job for a first impression as the low component count makes this easy enough.

Incidentally Jez, I was not considering offering boards or modules using this circuit when I said I would get some boards made. This is purely to make life easy for component comparisons as a fun personal project in the spirit of the forum ethos and I am happy to disclose any interesting findings as the project progresses.

[Wakefield Turntables]

Any further development on this? I'm using my Lentek (Nick G modded) to very good effect, it's the new year so I fancy something trying something different.

[Arkless Electronics]

Any further development on this? I'm using my Lentek (Nick G modded) to very good effect, it's the new year so I fancy something trying something different.

I didn't get round to it and have been to busy with more important stuff TBH... I can't see me ever taking it further now the mental impetus has been lost. I doubt anyone would spend say £300 - £400 on a hugely souped up version of the Lentek anyway...

[Marco]

I would, if it was good!

Marco.

[Wakefield Turntables]

I didn't get round to it and have been to busy with more important stuff TBH... I can't see me ever taking it further now the mental impetus has been lost. I doubt anyone would spend say £300 - £400 on a hugely souped up version of the Lentek anyway...

why dont you tell us what you'd do to the Lentek and then lets US decide if we want to spend £3-400 of our money. You shouldn't make assumptions.

[Wakefield Turntables]

I'm looking into getting mine further modded. Just looking at components and speaking to my favourite cable maker to see if something can be rustled up. What this space.

[Arkless Electronics]

why dont you tell us what you'd do to the Lentek and then lets US decide if we want to spend £3-400 of our money. You shouldn't make assumptions.

No. That's not how I do things. Any customer with the technical knowledge to know how any mods I make will be likely to effect things could design it themselves anyway... Those without that knowledge are in no position to comment anyway...
What I was proposing was NOT to take in Lenteks and modify them but to build new "Lentek's" from scratch in a much bigger case, which would be required for the mods I had in mind.
I can make one's of my own design that are much better anyway. As recent reviews show.

[Wakefield Turntables]

No. That's not how I do things. Any customer with the technical knowledge to know how any mods I make will be likely to effect things could design it themselves anyway...
I can make one's of my own design that are much better anyway. As recent reviews show.

Probably not the best way to handle customers Jez in that some of use like an active role in design and parts selection. I'm sure you can a much better head amp but I've not heard it so can't judge, the Lentek is a known entity and therefore worthy of investment unlike yours which is something that I'd have to spend £700+ on before I even had chance to hear it. A single review dosen't make a product. Anyway I'm already on with this project. Good luck with your future sales.