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apt holman

  1. sae-7125

    TL072CP lifespan (apt holman preamp)

    anyone happen to know if the tl072cp has a particular service lifespan out in the wild? currently have an apt holman preamp exhibiting some rather odd tone control and bass mode amplitude+phase issues when comparing left vs right channel output (tone generator as source). preamp was recapped...
    • sae-7125
    • Thread
    • apt holman no ventilation opa2134pa opamp phase issue rc4558p relay issue tl072cp tone control
    • Replies: 20
    • Forum: General Audio Discussion
  2. goldswimmerb

    Apt Holman Preamplifier Tone Switch Pop

    Hey all, I have an APT Holman Preamplifier I recent recapped and gave some new transistors as the 2SC1345s had gone noisy. I have it all back together now and everything is working beautifully, however, if I switch the tone defeat switch on/off the unit gives out a fairly decent bit of DC...
  3. Beefcurtanz

    Marantz 2240 for an APT Holman Preamp?

    Looking for some thoughts on a trade that was proposed to me that I am stewing over, my fully operational Marantz 2240 for a fully operational APT Holman Preamp. I am more of a separate component guy, but it just feels like I am trading down a little bit. Please give me some things to consider...
  4. Gazdatronik

    Calling all APT Holman experts

    I just finished recapping the APT preamp, only the electrolytics. The metal foils and the chiclets remain. It sounds pretty much the same to me, minus the hum issue and the headphone amp imbalance that was there before. Yay. Is it necessary to re-calibrate it, as in, are any of the caps in the...
  5. Barteezee

    BeyerDynamic DT990 600 Ohm w/ Apt Holman Preamp?

    Hey all, I have a Thorens Jubilee Gold TT (TD 147 w/auto stop) with an Apt Holman Preamp but never used headphones with them. Ebay has BeyerDynamic DT990 600 Ohm Over-Ear Headphones - Chrome Special Edition 483966BC for $139 which seems like a great deal. Any thoughts on these phones with...
    • Barteezee
    • Thread
    • apt holman beyerdynamic thorens jubilee
    • Replies: 15
    • Forum: Headphones
  6. AnalogueDude

    Quad 405 into switched plug on Apt Holman OK?

    I’ve searched this and other forums, there seems to be mixed opinions on this. However, I believe the Quad 405 was always meant to be plugged into a switched outlet on a pre-amp (it has no power switch), and my Apt Holman is rated to a maximum of a Kilowatt soooo... shouldn’t be a danger in...
    • AnalogueDude
    • Thread
    • amp apt holman preamp quad quad 405 switched power
    • Replies: 3
    • Forum: Solid State
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