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tube amp help

  1. mcaddie7

    Eico 2536 Receiver - How to Bias

    Hi all! received an Eico Tube receiver that looked pretty cool for cheap. I checked all of the tubes (same replaced in 69) and they all pass, albeit the 4 matching pairs highlighted in red appear to have more of an “open” according to my tube tester. Anywho, replaced all electrolytic caps and...
    • mcaddie7
    • Thread
    • bias adjust bias adjustement tube amp tube amp help tube receiver
    • Replies: 3
    • Forum: Tube Audio
  2. amirnir

    Restoring Sherwood S-5500 capacitors inquiry

    Hi there! I've got this amp last year in pretty good shape but it needed a re-cap, etc. I just decided to go back into this project and while examing the components I need, I found that one of the electrolytic capcitors is functioning in a negative current. Maybe it is a silly question, but I...
    • amirnir
    • Thread
    • capacitor can restore tube amp help
    • Replies: 5
    • Forum: Tube Audio
  3. Subchannel

    LE Audio VM60 problems

    I bought a pair of LE Audio VM 60 tube monoblocks, and the previous owner have put one of the output tubes in the wrong way (broken tab on the tube socket). I have tried to measure it, and D159 measures different from the other three (one for each output tube. Three measures a bit over 3ohms...
    • Subchannel
    • Thread
    • tube amp tube amp amplifier tube amp help
    • Replies: 15
    • Forum: Tube Audio
  4. J

    My dad passed and I found a half assembled DIY preamp without schematics. Any help or advice would be great.

    My dad passed three years ago and I'm picking up the pieces. I didn't know that he left me with this in progress preamp until recently. He also has a phono stage (no pictures in this post), but it's even more incomplete. With a family friend (close friend with my dad), we determined that it is...
    • jwbcp
    • Thread
    • tube tube amp amplifier tube amp build tube amp help
    • Replies: 53
    • Forum: Tube Audio
  5. L

    Tube rolling suggestions for more detail retrieval

    Hi all, I recently bought a DIY tube headphone amplifier. It does all the nice things associated with tubes, but is not the end-all-be-all when it comes to detail retrieval. I am not very familiar with tube brands and their specific characteristics and while I am reading up on them, I was...
  6. J

    How much power is enough when going to a tube amp?

    Hi. I'm a solid state guy looking to add a tube amp but not sure how low I can go in output power (watts) for my speakers. I am using Borea Triangle 3 ways with double 6 in. woofers. They are rated at 92 percent. I don't need to shake the walls but I also want to drive the speakers nicely...
  7. R

    Variac Recommendations

    Hey there, I just acquired a Dynaco SCA-35 (integrated tube amp) from original owner and looks like it hasn't been used in a number of years. I need to go through it and clean it up/restore worn out components. Any recommendations on a Variac to buy for the project? Thanks!
  8. J

    Help with HH Scott 208 (later model)

    Hi all! I recently purchased a HH scott 208 with out any tubes. I plan on cleaning and recapping to get it back in working order. Upon closer inspection i came across some odd things. 1. two 1/4 in. jacks (one mono and one stereo) were added to the audio inputs. My thought was that the previous...
    • jonkelley
    • Thread
    • 208 hh scott scott tube amp help tube amp maintenance
    • Replies: 20
    • Forum: Tube Audio
  9. Codojimbodie

    Converting Hammond Amp to Guitar Amp.

    I recently have acquired a H-AO-70-1F as well as the H-AO-71-1 power supply along with the H-AO-72-0 reverb amp/reverberation unit. I have never messed around with tubes or much electrical components before this but am an avid guitar player and have become intrigued as to how I can turn this...
  10. Alfmonster

    Recommendation for MC225 external VU meters

    To prevent overloading the MC225, I was wondering if anyone had recommendations of external VU meters of some sort or other power output monitor. Any help would be greatly appreciated!
    • Alfmonster
    • Thread
    • mc225 mcintosh mcintosh mc225 tube amp tube amp help vu meter
    • Replies: 9
    • Forum: McIntosh Audio
  11. D

    Tube replacements/equivalents

    Have a Unison Research Simply Two. This unit is auto biasing. Replaced the preamp tubes with NOS Amperex 12au7 - fantastic! Need to replace power tubes. Manufacturer says EL34/6CA7. Is a 6CA7-EL a true replacements? Several other EL34 have suffexs too. In another thread, someone used KT-77, a...
    • Dclay1
    • Thread
    • nos vs new tubes tube amp help
    • Replies: 8
    • Forum: Tube Audio
  12. artsybob

    Capacitor Questions

    I am in the process of recapping my Realistic SAF-40D integrated amp. One of the filter capacitors I bought to replace an old one isn't exactly the same values. Would I be able to replace a 20uf 50V capacitor with a 25uf 50V? The amp also has two two-sectioned can caps that are each rated 40uf...
    • artsybob
    • Thread
    • capacitors tube amp tube amp help
    • Replies: 4
    • Forum: Tube Audio
  13. BT709

    Marantz 8B Brought back to life and sounds great... but...

    So... I bought this Marantz 8B up from an old friend. It hadn't been run for at least ten years and the full history is cloudy. I gradually brought it up to voltage over several hours to reform the caps. Used a variac and monitored the amperage. It biases perfectly and holds. Been listening to...
    • BT709
    • Thread
    • marantz 8b repair tube amp help
    • Replies: 52
    • Forum: Tube Audio
  14. artsybob

    Westinghouse Console Problem (Right Channel)

    Hi Audiokarma. My recently restored Westinghouse HM-1411 stereo console was working fine until a little while ago the right channel started sounding quieter than the left channel. At first I thought it might be a phono cartridge issue but I played the radio and I played my iPod through the AUX...
  15. VTDave

    Vincent SA-31 Tone Control Fail

    I'm hoping for some advice on where to start trouble shooting this Vincent. It performs perfectly well when the tone controls are disabled. When engaging the tone circuit the whole sound field changes even with controls at null. By running only a set of headphones I have determined - 1) Left...
    • VTDave
    • Thread
    • preamp repair help tube amp help vincent
    • Replies: 3
    • Forum: DIY
  16. N

    Tube Amp for Focal Arias

    Hello audiokarma members, First I'd like to say I've been a lurker on here for a while but I've never found the answers to some of my questions ive had about my journey into audiphilism. *if I'm in the wrong area or whatever please move me, this is my first post so my bad* Alright so, I own...
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