News: Trouble logging in? Log in from the login page.
August 05, 2020, 09:29:51 PM

Recent Posts

Pages: 1 2 [3] 4 5 ... 10
21
General Discussion / Re: NEW Electrostatic headphone amp
« Last post by adydula on Today at 04:07:34 AM »
Wow!!

Havent heard VTVM in a long time!!

One of the questions I used to ask prospective electronics tech hires for IBM "back in the day" was "What the difference between a VTVM and a VOM"??

:>)

Alex
22
S.E.X. Kit / Re: Progress Update
« Last post by Karl5150 on Today at 03:37:16 AM »
Nice! The polished steel against the black top plate really works. Enjoy.
Karl
23
Foreplay III / Re: Foreplay III redux Fi edition
« Last post by Thermioniclife on Today at 03:07:48 AM »
Hey Natural Sound,
I got lucky this time, no damage and never lost electricity. Just a bunch of limbs and branches down.
Thanks for the generous offer but you should keep those items, you never know when that cap may come in handy.
Thanks again,
Regards.
24
MonAmour / Monamour 45???
« Last post by kevner21 on Today at 12:59:33 AM »
Can a monamour be changed to a 45 tube output?
25
S.E.X. Kit / Re: Progress Update
« Last post by mcandmar on Yesterday at 11:28:21 PM »
Lovely build, congrats.
26
S.E.X. Kit / Re: Progress Update
« Last post by Paul Birkeland on Yesterday at 04:54:29 PM »
This leads me to conclude that there is nothing wrong with the amp itself, but that most likely, the noise is coming from the DAC (or a likelier culprit, my computer). I haven't installed the C4S upgrade yet, as I'm still listening to the stock S.E.X, but will experiment with it in a month's time or so, to see if the noise floor can be improved upon.
https://forum.bottlehead.com/index.php?topic=11676.0
You could try this mod, it may keep some of that grunge out.
Finally, a question regarding amp usage: when I power on/off the amp, is it OK to leave my headphones plugged in?
Yes.  The SEX amp does not need a load on the speaker terminals and it won't do any harm to your headphones if they are plugged in during powerup.  Your confusion is well founded, there's a lot of misinformation out there!
27
S.E.X. Kit / Re: Progress Update
« Last post by Darkblade48 on Yesterday at 04:16:20 PM »
So this is a long overdue update (yes, one could say I took my sweet time, slowly enjoying and savouring the build process!).

I finished gluing, prepping and staining the alder wood (ended up using a wood pre-conditioner, as recommended, followed by a dark walnut stain). It came out relatively well, considering it was my first time doing any kind of woodworking. Afterwards, several polyurethane clear coats (thinned down with some mineral spirits, also as recommended by some helpful folks online) and polishing, and the case was done.

I also finished up the electronic side of things, while waiting for the case to dry. It all came together earlier this week, and I am very excited to report that there were no mishaps along the way (all resistance checks and voltage checks went well, without any hitch). All that soldering practice came in handy ;) I swapped out the stock potentiometer for a Blue Alps (RK27) that I ordered from Mouser, and thankfully, there were no mishaps there either.

An interesting point that I noted was that the amp was not 'black' (as in, the noise floor seemed high - there was some static/hissing, even with no music playing). Points that I noted were:
- With nothing plugged into the RCA inputs, there was no noise in the headphones, even if I turned the volume knob all the way up
- With a Topping D50 DAC plugged into the RCA input (which was plugged into my computer via USB), there is no noise  to around the 10 o'clock position of my pot (no music playing). Then, there is some hissing beyond this point (though, it is worth noting that listening at a volume past 11 o'clock is already intolerable)
- With a portable DAP (digital audio player; Cayin N3) plugged into the RCA input (via 3.5 mm line out), noise is not heard until around the 3 o'clock position

This leads me to conclude that there is nothing wrong with the amp itself, but that most likely, the noise is coming from the DAC (or a likelier culprit, my computer). I haven't installed the C4S upgrade yet, as I'm still listening to the stock S.E.X, but will experiment with it in a month's time or so, to see if the noise floor can be improved upon.

Finally, a question regarding amp usage: when I power on/off the amp, is it OK to leave my headphones plugged in? I have been taught that I should turn on the amp, then plug in my headphones. When turning off the amp, I should unplug the headphones before turning off the amp. However, I'm lazy, so was wondering if I could just leave my headphones plugged in all the time...There is some confusion for me here, as I know there are some amps that also require a resistive load across the jack when turning on, but I am not sure what is the case for the S.E.X

Sorry for the long post/comments/question! As always, I look forward to everyone's replies

Summary of photos:
1) Staining completed
2) A decent shot of the amp
3) The amp in its new home. Excuse the mess of cables (perhaps they might be causing my noise!)
28
Foreplay III / Re: Foreplay III redux Fi edition
« Last post by Natural Sound on Yesterday at 02:23:26 PM »
Hi Lee,

I'm a reformed Long Islander from Suffolk County. Good luck with the weather event.

Hey I have something cool if you want it (and if I can find it). Bottlehead often presents, "while supplies last" type offers. For example recently a premium RCA 12AU7 clear top was offered with the next X number of Crack kits... That sort of thing. Well years ago when I bought my FPIII the goodie was a Vitamin Q bypass cap for the 0D3. I upgraded to the Extended Foreplay which eliminates the 0D3. Somewhere I have that cap still attached to an octal socket. I no longer have a need for it if you want it. I can also put some NOS 0D3 tubes in the box. No charge to you. I'll even pay for slow boat shipping. Just let me know.
29
Kaiju Stereo 300B amp / Re: OA V problem
« Last post by Alby0521 on Yesterday at 01:11:18 PM »
Awesome.

Thanks
30
Foreplay III / Re: Foreplay III redux Fi edition
« Last post by Thermioniclife on Yesterday at 01:09:36 PM »
Roger That Doc, Sorry To here that u Are not available, perhaps i can find someone else. Say hi to Queen For me, Luv you both.
Deke, i bent the F.W. protectors by hand using the last flat(unbent panel) with the standoff's installed and a couple of spring clamps to hold the previously bent corner. Again, P.L.and H to all. I'm out 4 Tonight.
Pages: 1 2 [3] 4 5 ... 10