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Head amp interest check

Discussion in 'trade discussion' started by Arkless Electronics, Jun 20, 2022.

  1. Arkless Electronics

    Arkless Electronics Trade: Amp design and repairs.

    Leading on from the thread "Can anyone recommend a good phono step SUT", where more details can be found.

    The idea is for a transimpedance head amp for LO MC carts.

    Doing some sounding out to see if there is enough demand for such a niche item to justify my building a demo unit, "rough and ready" looking no doubt as I would simply be using whatever casework is to hand or dirt cheap to buy in so as to make something that can demonstrate the sound quality of such a unit without it costing me a fortune in slinky bought in casework etc.

    Let me know:)
     
    chiily and ducatiman like this.
  2. sideshowbob

    sideshowbob Champagne fascia aficionado

    I'd be interested. Have used a few head amps, and some SUTs. Currently using an SPU into an Ortofon T20 SUT very happily, but always keen to try new things
     
  3. Arkless Electronics

    Arkless Electronics Trade: Amp design and repairs.

    Aha we have the 4th intrepid traveller down the head amp route I needed to justify making a demo unit:)

    So that's:

    Early

    Vinny

    Sonddek

    Sideshowbob

    Rockhopper

    matt j

    nmtjb

    mjhill1234

    mand

    onespeed

    Tarzan

    eevo1969

    Darren L

    Ali T

    So far...

    It will, for demo purposes (and assuming I don't find "argh that sounds like shite" when I have a first listen myself and it's a non starter!) be a "lash up" in old casework I have lying around etc to keep the cost down to bugger all for me to get it around a few fishies and see if they like it. If so and people wish to order then we can discuss silver or black casework in various styles and all that guff:)
     
    Last edited: Sep 7, 2022
    Pkay and sideshowbob like this.
  4. Rockhopper

    Rockhopper pfm Member

    Would be interested in joining the club.
     
  5. matt j

    matt j pfm Member

    Only just seen this, put me down please Jez.
     
  6. Arkless Electronics

    Arkless Electronics Trade: Amp design and repairs.

    That's great guys:)

    I've updated the list above and put it in order of who asked first.
     
  7. nmtjb

    nmtjb pfm Member

    I'd be interested in trying it out please
     
  8. Arkless Electronics

    Arkless Electronics Trade: Amp design and repairs.

    Name added to list.

    Wow it took me about 2-3 years to find anyone interested enough in head amps to even try the last one I offered for demo!
     
  9. nmtjb

    nmtjb pfm Member

    I still like the old one I have, equinox head amp which was developed, I understand, for ortofon mc3000, battery powered when operating.
     
  10. Arkless Electronics

    Arkless Electronics Trade: Amp design and repairs.

    Ordered casework for head amp, case for PSU, mains transformer, phono sockets and earth posts today:)
     
    matt j, Rockhopper and sideshowbob like this.
  11. mjhill1234

    mjhill1234 pfm Member

    Would also like to be on the list as a prospective buyer :)
     
  12. mand

    mand pfm Member

    Add me please
     
  13. onespeed

    onespeed pfm Member

    interested here please
     
  14. Arkless Electronics

    Arkless Electronics Trade: Amp design and repairs.

    New names added to list:)

    I found a suitable metal case for it. It's die cast alloy and powder coated black. Also found a suitable in-line PSU case in ABS plastic. Both are IMHO "nice enough" to be the final version IMO but obviously feedback welcome on ALL points.

    So expect a satin black metal box about 2"H x 3.5"W x 4.5"D, featureless other than an LED on the front (I haven't decided yet which side will be the front), rear to have input and output phono sockets, earth post, socket for power lead (probably locking DIN plug) and a high/low gain switch. I can provide as many gain settings as I like and was going to make it several but I reckon two should be enough. This then makes it easy to use a good quality toggle switch on the back panel rather than having to open the case to fiddle with little DIP switches. Note that this is a transimpedance stage and hence gain is set largely by the internal resistance of the cartridge, plus it intrinsically does not need any loading facilities.
     
    Tarzan likes this.
  15. Tarzan

    Tarzan pfm Member

    May l go on zer list please Jez?:)
     
  16. Arkless Electronics

    Arkless Electronics Trade: Amp design and repairs.

    Added to list. So you are using an MM stage with SUT these days then?
     
    Tarzan likes this.
  17. Arkless Electronics

    Arkless Electronics Trade: Amp design and repairs.

    Sorry to be Captain Obvious here but Just in case anyone on the list is making what it seems are very common misunderstandings about head amps (it happened yet again in a thread on the Audio pages just yesterday).... A head amp is not a phono stage and nor is it a headphone amplifier. It is of course an alternative to an SUT :)
     
  18. eevo1969

    eevo1969 UXB

    Add me to the list please Jez. Any idea of final cost to customers?
     
  19. Darren L

    Darren L pfm Member

    May I be added to the list please.
     
  20. Arkless Electronics

    Arkless Electronics Trade: Amp design and repairs.

    The closest I'm willing to go on pricing it is £400 - £600. It still only exists as an increasingly full box of parts waiting assembly and a computer simulation of the actual circuitry so much is still "up in the air".
     

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