sregor's Recent Activity

  1. sregor replied to the thread Hafler DH-200 MOSFET info?.

    577134 = 2SK134 591049 = 2SJ49 Those are the Hafler part numbers (from the DH200 assembly manual) The 2 and 3 are for matcjing purposes...

    Aug 14, 2018 at 9:38 PM
  2. sregor replied to the thread Dog woke up paralyzed..

    Thoroughly check for ticks. There are some nasty things that can be caused by them, though rare in the US.

    Aug 14, 2018 at 2:49 PM
  3. sregor replied to the thread Need Help with a Philips 212 - Stuck on 45 rpm.

    Which lamps are you using. If you use the wrong type, the circuits don't work right. The speed lamps should be 6 (or 6.3) volts at 50...

    Aug 14, 2018 at 6:44 AM
  4. sregor replied to the thread SAE 3000 Preamplifier diodes.

    Schematic. http://akdatabase.org/AKview/albums/userpics/10007/SAE 3000 Schematic.pdf They are rectifiers. Given this is a preamp, 1n4002...

    Aug 12, 2018 at 6:07 PM
  5. sregor replied to the thread Hafler DH500 - 2018.

    PC19c Checked manual - PC19c board does have offset adjustment (original dh200 didn't) ..just nit picking.

    Aug 12, 2018 at 5:42 PM
  6. sregor replied to the thread The first strangely failed STV diode I found..

    Just a thought - I wonder, given the price of STV-4s, if it were a counterfeit part previously put in.,.. Good catch

    Aug 11, 2018 at 10:10 PM
  7. sregor replied to the thread What is setting BIAS and DC offset ?.

    Think of output stage as hot and cold faucets. And you want to be able to turn either one on very quickly. However, to turn them...

    Aug 11, 2018 at 1:53 PM
  8. sregor replied to the thread Pioneer SX-880 goes into protection when turned up - has anyone ever solved this issue?.

    No - use a non polar or bipolar cap - silkscreen won't matter. (NP or BP caps don't have + or - designations.)

    Aug 10, 2018 at 10:39 AM
  9. sregor replied to the thread Pioneer SX-880 goes into protection when turned up - has anyone ever solved this issue?.

    I would try changing c418 (47uF16 V). The function is to filter out audio so only DC will trigger protection circuit. I would also...

    Aug 10, 2018 at 9:21 AM
  10. sregor replied to the thread Transistor Substitutions.

    Pin 2 (center pin) and Pin 4 (Tab) are the same. (collectors). There are some applications which have the center lead removed and the...

    Aug 8, 2018 at 8:11 PM
  11. sregor replied to the thread SAE 2200 - One channel distorted.

    0.22 ohm - should be readily available.

    Aug 8, 2018 at 8:00 PM