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preamp

  1. H

    Preamp help for a noob

    Hi all, first post here. I’m setting up a new system in a new house and I hit a snag. I got a great deal on new Klipsch RP 600m speakers and decided to start my hifi journey based mostly on how much I could spend on each component without my wife stabbing me in my sleep :) I bought a NAD D 3020...
  2. kentuckycat

    New 76/12J5 Line Stage Preamp Build

    I'll be building preamp for my tube amplifiers very soon. I've ordered all of the parts and have received most of them already. I was looking for a low gain, line stage design and landed on the JE Labs 76/6SN7 design, which is the basis of the pre that I'll be building. I started shopping...
  3. KNielsen

    Acurus L10 problem

    Hey AK I got some problems with a newly modded Acurus L10 preamp. Depending on the volume, the left channel playes louder then the right. Worst at about 12 o'clock volume on the scope. The two channels lines up to around 9 o'clock and then split on the o.scope, and after 12 o'clock the start to...
    • KNielsen
    • Thread
    • acurus diy l10 mondial preamp volume
    • Replies: 142
    • Forum: DIY
  4. S

    Any help with this 6sn7 circuit biasing

    Hey guys just wondering if someone can help me with this kit amp it's a 6sn7 quad pp preamplifier biased hot in class A It's got a 300v CCS power supply And was shipped with the specified parts for 300v operation I only have a 250v transformer so my bias will be off a little and not hot enough...
    • Steptoe6sn7
    • Thread
    • 6sn7 preamp tube biasing
    • Replies: 5
    • Forum: DIY
  5. Benz

    External volume control for MAC 1900

    Greetings, I just had my MAC 1900 recapped and faulty transistors replaced. After running it for about 100hrs it sounds great, better than it ever has so I'm thrilled with that. The volume control however is quite uneven (L/R) at lower volumes. I am not looking to replace the pot at this time...
  6. raymondjiii

    Repair of Adcom GTP 500 II volume pot and motor

    I have been working on a repair of this unit. It looks like the unit was dropped on it's face. I was able to repair the on/off button internals, I am going to put some jumpers on the little FM Scan board that cracked in half (only has the two buttons attached to it, plus small ribbon.) The last...
  7. T

    New Here Hi yall trying to sort out Shure stylus & cartridge's

    Hi I have a vintage pioneer pl-516 that I enjoy very much mated up to klipsch r51. I have no preamp other then what is in the amped speakers on phone mode. Im running a green stylus that I got from needle Dr. years back. I want to get a quality stylus and cartage. Im looking at the N95ed sas/s...
  8. lattiboy

    Recommendations for a mid-priced tube preamp

    Hello, I’m looking for something a few steps up from one of those FX Audio $50 tube preamps, but still under $500 (new or used). Two outputs would be nice; but not necessary. Also, the ability to run in passive mode. Totally fine with Chinese brands as I’ve generally had great luck with their...
  9. O

    Aragon Aurum preamplifier

    Hi once again - I'd really like to know if anyone remembers or is familiar with the Aragon Aurum preamplifier. I'd love to hear any opinion on this piece of equipment Also, how it compares to a Bryston BP-26 preamp thanks in advance...
  10. From bottom up: 1977 Sansui 9090DB, 1970 Sansui 5000A, 1969 Sansui 5000A, 2011 Harman/Kardon HK3390

    From bottom up: 1977 Sansui 9090DB, 1970 Sansui 5000A, 1969 Sansui 5000A, 2011 Harman/Kardon HK3390

    Using the HK3390 as a preamp only. Using the 9090DB as an amplifier only. Pushing a pair of 1992 Cerwin-Vega DX9s directly from the preamp at 4 Ohms. A pair of 1977 McIntosh ML-10Cs with a 1970 Sansui 5000A, and a single 1957 JBL C40 Harkness Lowboy with a 1969 Sansui 5000A in mono
    • cykotic
    • Media item
    • 9090db harman/kardon preamp sansui
    • Comments: 0
    • Category: Sansui Gallery
  11. tcdriver

    Power Supply Model C-4PS01 For Use with a McIntosh C-4 Preamp

    McIntosh C-4 Power Supply Design Idea This post presents a Design Idea for an inexpensive power supply to power a McIntosh C-4 Audio Compensator. Early versions of this preamplifier used 6.3VAC to power the filaments. Later versions used an internal voltage doubler to provide a nominal 12VDC...
    • tcdriver
    • Thread
    • c-4 c-4ps01 mcintosh mcintosh c-8 mono power supply preamp tube
    • Replies: 5
    • Forum: McIntosh Audio
  12. MarmotDavid

    What to drive new Magnepan 3.7i's

    I've got a new pair of Magnepan 3.7i's. Currently I'm using my older, unrestored Counterpoint SA-1000 tube/hybrid preamp and and old solid-state Conrad Johnson Sonograph SA-250 power amp. The setup sounds pretty good but I'm sure it could be improved with some newer preamp and power amp, so...
  13. ocdecio

    SX-1250 - no sound on preamp

    Working on my first Pioneer. I repaired both driver (power amp) cards and that section is working great. Stabilizer card has +-65V. However when I connect the jumpers on the back, or put a scope on the Pre-Out I get nothing, zilch, on either channel, on any input (FM, AM, Phono, Aux etc). I...
  14. funkingkyle

    Preamps under ~$800 with phono and tone control

    What do people like in this range? Thinking about replacing my old Marantz, which needs a recap, with something modern. Here's what I'm running now: Marantz 2245 (using as preamp) Kit-built (by me) ICEpower125ASX2 power amp Seas Bragi MTM kit-built (by my friend) speakers Denon DP-62L...
  15. kjack48230

    Looking for service manual for Onkyo Integra P-306RS Preamp

    Hello everyone, I'm looking to do a re-cap of my P-306 but need a service manual or at the very least, a schematic. If anyone out there has one they could share, I'd greatly appreciate it. Hifi engine only has the operators manual. Thank you in advance.
  16. funkingkyle

    Preamp advice

    I'm trying to decide what to do with my preamp set up. Currently this is what I'm running: Marantz 2245 (using as preamp) Kit-built (by me) ICEpower125ASX2 power amp Seas Bragi MTM kit-built (by my friend) speakers Denon DP-62L turntable S.M.S.L M200 DAC connected directly to server computer...
  17. toroechado

    Preamp recomendation Rotel maybe or...?

    Hi! I'm looking to upgrade my preamp. I currently have a Parasound P3, although happy whith the sound it has bad S/N ratio, i can hear the hiss in the background when close to the speakers... and as you know, once you hear it, you can't unhear it... My requirements are: -Digitaly controlled...
  18. ceylon

    tube hifi newbie thread

    hey u guys. im lookin for some guidance on cathode followers and tube preamps. i got a conrad johnson PV8 12ax7 phono, 5751 gain, 5965 cf) and a van alstine fet valve cf RB (12at7 gain, 12au7 cf). how important are the cf tubes to the SQ and presentation? to what extent does the CF affect...
    • ceylon
    • Thread
    • cathode follower conrad-johnson preamp van alstine
    • Replies: 5
    • Forum: Tube Audio
  19. instatone

    Phono preamp

    Any phone prestage recommendations to pair with my system? What do you recommend for a MM phono stage standalone upgrade for my Thorens TD160 with MM cart? It is driven currently by McIntosh 2505 and C26. Current speakers are JBL 4311 with a SVS sub. Price range is sub $600 Thanks friends!
  20. tcdriver

    Interelectronics Model 85 Consolette Preamp Information Request

    I have an Interelectronics One Hundred amplifier and I am interested in finding out information on the Model 85 Consolette preamp. The preamp was designed to draw its power from either the power amplifier or a stand alone power supply. What I would like to know is: What are the B+ Voltage and...
    • tcdriver
    • Thread
    • consolette interelectronics preamp tube
    • Replies: 19
    • Forum: Tube Audio
  21. SebVanDijk

    Volume issues with Denon PRA-S10 (opamp?)

    Hi everybody, Since about a year I'm the proud and happy owner of 2 Denon POA-S10 monoblocks with matching PRA-S10 preamp. The only problem I have with the PRA is the quite challenging volume control. Changing the volume is a matter of delicately touching the remote to prevent the volume being...
    • SebVanDijk
    • Thread
    • denon poa-s10 pra pra-s10 preamp s10
    • Replies: 5
    • Forum: DIY
  22. C

    Looking for help with a Carver C4000 Preamp Autocorrelator

    Hi, I have a Carver C4000 that I just picked up, and apparently it is missing the RCA outputs for the tape monitor 2 and external processor. If I don't have those options, it's not the end of the world, but when I opened the unit, I saw two wires that appear to have been severed or maybe came...
    • Confusilated
    • Thread
    • c4000 carver fix preamp
    • Replies: 0
    • Forum: DIY
  23. J

    Consistently faulty preamp tubes?

    Hello, I have recently purchased a Dynavox TPR-3 pre-amp that uses 6n3 type tubes. However after purchasing now two sets of tubes and being sent a single replacement tube, three of the five tubes tested have been faulty after minor usage. The two cheap Chinese tubes the pre amp came with work...
    • jddonuts
    • Thread
    • 5670 6n3 6n3 compatible help preamp question tubes
    • Replies: 10
    • Forum: Tube Audio
  24. bzenic

    Marantz SR4000, One Channel Noisy When Using AUX

    Here is my issue: Both channels working well on FM with earphones and/or speakers. When I use AUX input things are different: one channel shows the typical "bad transistor" symptoms: crazy change in volume with distortion and noise. I was thinking that the most likely culprit would be a...
  25. MarmotDavid

    Tube Preamp Questions

    These may be silly questions, but here goes.... I have an older Counterpoint SA-1000 hybrid tube preamp, circa 1988-1990 ish. It has a phono section with two 12AX7 tubes and line section with one 6DJ8 tube. I like it a lot and I'm in the process of upgrading tubes. First question -When I am...
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