Recent Posts

91
Crack / Re: Crack/Speedball no longer making sound after move.
« Last post by Paul Birkeland on March 14, 2024, 02:32:13 PM »
1 through 13:  All zero.
15 232v DC
13 and 15 connect with a 270 ohm 5W resistor.  Yours is very likely not well connected.
92
General Discussion / Re: Need help with an unusual problem
« Last post by Paul Birkeland on March 14, 2024, 02:30:51 PM »
It's been a while since I looked at your initial thread, can you remind me of the cartridge being used and any step-up devices? 

It is technically possible to overdrive the grid of the 6922 in the Eros, but you'd have to try really hard to do that, and it wouldn't disappear in your third measurement. 

It is also possible to overdrive a Moreplay and the BeePre 2, but again you'd have to have an exceptionally hot amount of output coming out of the phono preamp.  If this is all that's happening, then there are plenty of inexpensive and easy solutions to that problem. 
93
General Discussion / Need help with an unusual problem
« Last post by Larpy on March 14, 2024, 11:59:51 AM »
Hello all,

Last fall I was having trouble with vinyl playback.  I started a thread that went 4 pages before I realized I had all the good advice I needed and it was time for me to troubleshoot on my own.  No need to rehash that thread (https://forum.bottlehead.com/index.php?topic=15152.0, but in the course of trying to track down the problem, I created all sorts of new problems.  As best I can tell, the original problem was a bad transistor (or a bad solder connection to that transistor) in my Eros.  I now feel confident that I have fixed the original issue (and all of the collateral damage I created in trying to find that problem) except for one that I simply cannot figure out.

There is something "off" in my vinyl playback and the only non-objective evidence I have for it consists of asymmetrical waveforms I get when I record LPs.  It is a weird problem whose fix eludes me.

Here is what I'm experiencing in a nutshell.  The audio signal I get from playing an LP through my Eros to my preamp (routed through) the "preamp out" to a DAC to my laptop = asymmetrical waveform.  See first attachment.

The signal I get recording a CD from my CD player to my preamp (routed through "preamp out") to a DAC to my laptop = symmetrical waveform.  See second attachment.

Doesn't matter which LP I play or which input my analog signal is plugged into at the preamp.

OK, so you’d think there’s something amiss in my analog chain, but get this:

The signal I get from my turntable and Eros directly to a DAC to laptop = symmetrical waveform(!).  See third attachment.


So there’s something wrong with my preamp?  Apparently not.  I swapped it out with my Moreplay and I got the same results as above.

What on earth could cause this?


94
Bottlehead Power Cord Kit / Re: The right angle plug
« Last post by Karl5150 on March 14, 2024, 08:44:41 AM »
j.-
I too found mine on Amazon, purchasing several of the different R/L configurations.
Thanks, yes it is an air-cooled 2012 T100 - Sort of like the BH kits - old-school vibe with some modern engineering.
Karl
95
Bottlehead Power Cord Kit / Re: The right angle plug
« Last post by mad goalie on March 14, 2024, 07:45:01 AM »
Thanks for the info/confirmation, Doc and Karl. We'll see how it goes over time.

Karl, if I may ask, where do you get your adapters? For the sake of convenience, I found the one I'm using on Amazon - which makes me question the overall quality (to Doc's point). Also, nice bike - is that a Bonneville?

j
96
Crack / Crack/Speedball no longer making sound after move.
« Last post by bluelair on March 14, 2024, 06:38:06 AM »
I recently moved the amp from my office to my home. It was working perfectly, all voltages within spec.
Now, when turned one, both tubes glow, and I know the signal is good, but I'm getting I get zero output,, no hum, no crackle, nothing. 

I cannot find any visible damage like any loose or broken connections, or shorted connections.  Power cord is good, no fraying or damage to the wires either.  I've checked all wires and they appear still be soldered intact.

Voltages readings are nearly all zero, except for 2:

1 through 13:  All zero.

14 - 0
15 232v DC
20 0
21 232v DC

This is with the black meter probe clipped to Pin 16 on the crack.
97
General Discussion / Re: Forum fixed
« Last post by Doc B. on March 14, 2024, 06:14:34 AM »
Click (change) at the top where it says current theme. That will open a big list of choices.
98
General Discussion / Re: Forum fixed
« Last post by Thermioniclife on March 14, 2024, 06:00:34 AM »
sl-15, It's odd, I did what you suggested and did not see any color change options. The color is orange the only blue color is the poster's name, It's really not a big deal. Thanks for the reply
99
Eros Phono / Re: Eros phono final voltage test fail
« Last post by Nitsua08 on March 14, 2024, 03:24:00 AM »
Ok, that’s what I figured. Voltage coming into the board is fine, around 220. I’ll look into cleaning up areas around the socket pins.
100
Bottlehead Power Cord Kit / Re: The right angle plug
« Last post by Karl5150 on March 14, 2024, 03:19:33 AM »
I use these (although likely a different brand from the look) on several BH and other audio and video components for the same reasons. I even have 2 different configurations daisy-chained in a particularly tight location and haven't noticed a sonic penalty. Admittedly, I haven't pulled the trigger on a BH cord to know if there is a difference in your exact situation.
Karl