Best Of
Re: What did you do to your stereo rig today?
Some aesthetic changes after the last couple months. Before and after:
displayname
19 ·
Re: Post a picture.....any picture...part deux...
Finally!
(seen on hifihaven.org -- carrying the torch of rational thinking
)
(seen on hifihaven.org -- carrying the torch of rational thinking
)
mhardy6647
4 ·
Side of the road find RT1000i
Picked up these on the side of the road. Hooked them up and figured out why. 1 amp dead and the other is buzzing. Decided to start with the buzzing one and the 4700uf filter caps seem to be bad. I don't have ESR meter yet but Fluke is not getting consistent reading on either. Measuring dc output I've got 25v on one side and 20v on the other with no loading. I've bought some cheap 35v 4700uf caps on Amazon for fast delivery and will install then report back. I'd not be surprised if this is the issue, installed ones are 25v and rail voltage is 25v so no margin. Internet searches seem to show some people had similar issue with filter caps so who knows. Not got much to lose right now, only invested $7 so far. Vinyl on face of speakers has shrunk and pulled away from wood. I'll have to source replacement for that if I successfully repair the amps. Also it looks like the RCA inputs might have fried, but possibly thats just discoloration (see pic).
Chuck_S
1 ·
Re: Building a vacuum tube tape preamp
Well, the next step is to get some new tubes. The ones I've been using are pretty sketchy, just ones lying Around from old projects. There's some noise on one channel and I'm pretty certain it's tube related. I've ordered some Mullards from Tube Depot that seemed reasonable, all things considered.
Knobs is a continuing issue. I didn't think it through when I drilled the faceplate, but any knob with a counter requires a small hole below the dial to keep the outside part of the dial from turning when the knob is turned. The second problem is that there needs to be more of the potentiometer outside of the faceplate so the dial has something to lock on. I may have to visit my machinist friend again.
The calibration process involves mostly learning how the various adjustments effect the playback response. If the playback head has a high frequency resonance then the input loading can be used. The gain adjustment can be used to carefully match the two channels, but can also lead to oscillation. The sections of the feedback that influence the bass and treble are going to be dependent on the characteristics of the transport and how a test tape looks when connected.
At this point the LED lights up and that's a beginning, right?
Knobs is a continuing issue. I didn't think it through when I drilled the faceplate, but any knob with a counter requires a small hole below the dial to keep the outside part of the dial from turning when the knob is turned. The second problem is that there needs to be more of the potentiometer outside of the faceplate so the dial has something to lock on. I may have to visit my machinist friend again.
The calibration process involves mostly learning how the various adjustments effect the playback response. If the playback head has a high frequency resonance then the input loading can be used. The gain adjustment can be used to carefully match the two channels, but can also lead to oscillation. The sections of the feedback that influence the bass and treble are going to be dependent on the characteristics of the transport and how a test tape looks when connected.
At this point the LED lights up and that's a beginning, right?
SeleniumFalcon
1 ·
Re: Vintage Monitor and SDA Speaker Deals
Thanks for the info, learned something new today.
HzTweaker
1 ·
Re: You’re doing it wrong…
I liked the first generation of the Comet. When it came back as an "upscale" Maverick, not so much.
pitdogg2
4 ·
