Recent Posts

11

Eros Phono / Re: Voltage check assistance

« Last post by phatfish on Yesterday at 03:47:50 PM »

Thanks Paul, I'm on it!  Iron set at 850f.  Mind sharing what this means and what voltages I should be seeing at A4/5?

Any theory on why I'm having issues with my joints on this board and not previous ones? 

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Eros Phono / Re: Voltage check assistance

« Last post by Paul Birkeland on Yesterday at 03:29:20 PM »

Well that is extremely helpful.  I would set your iron as high as it goes, then reflow all the solder joints on that C4S board aside from the LEDs (they don't take much heat to solder properly and they aren't appreciative of reflow efforts).  Concentrate especially on the middle lugs of each of those MJE350 transistors, as they are reluctant to flow out properly without a bit of dwell time.

13

Eros Phono / Re: Voltage check assistance

« Last post by phatfish on Yesterday at 03:26:28 PM »

A4 was ~58v.  Seemed to be slowly climbing starting at 57.3 and moving to 58.2 when I turned it off.  Should I leave it on to see where it settles?

A5 was ~51v.  Similar slow climb and I turned it off pretty quickly.

Measurements taken with the C4S board hooked back up btw. 

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Crack / Re: Crack, with small Speedball board

« Last post by Doc B. on Yesterday at 12:30:27 PM »

.jpg files upload fine. If the filename suffix happens to be .jpeg try changing it to .jpg

15

Crack / Re: Crack, with small Speedball board

« Last post by Paul Joppa on Yesterday at 09:16:36 AM »

From the attachments utility:

Allowed file types: doc, gif, jpg, mpg, pdf, png, txt, 3gp
Restrictions: maximum total size 25000KB, maximum individual size 25000KB

16

Crack / Re: Crack, with small Speedball board

« Last post by sfojws on Yesterday at 08:07:43 AM »

Thanks for the suggestions. I'm going to perform another check of the wiring, with a different meter, to try to uncover a broken wire somewhere. It appears that I have the transistors on the board oriented as shown in the assembly manual, but I'm open to any other advice that you can offer. I need to figure out a way to convert the photos to a format other than jpeg, as the forum utility does not seem to allow that format to be used. If there is a way to send them in the jpeg format, please let me know.

Many thanks.

JS

17

Eros Phono / Re: Voltage check assistance

« Last post by Paul Birkeland on Yesterday at 07:55:56 AM »

You need the tubes in there, not necessarily the C4S.  I'd turn the heat up a bit if you can. 

18

Eros Phono / Re: Voltage check assistance

« Last post by phatfish on Yesterday at 06:20:39 AM »

Thanks Paul.  I assume that should be measured with the c4s hooked back up and all tubes?

For what it’s worth I’m using cards Quad Eutectic and a Weller station set at 680f and I’ve soldered a crack + speedball in a similar way with success.  Don’t mean to imply that I’m not butchering it, just giving more information.

Do my IA/IB numbers mean the boards behind the C4S are working ok?

19

Eros Phono / Re: Voltage check assistance

« Last post by Paul Birkeland on Yesterday at 04:49:34 AM »

Can you very carefully measure the DC voltages at pins 4 and 5 of one of the front two sockets? (you don't need to do both)

On the front C4S board, that looks like either lead free solder or very low heat, possibly both. 

20

Crack / Re: replacement transformer installed resistance check problems [resolved]

« Last post by Paul Birkeland on Yesterday at 04:47:57 AM »

If the amp worked for a while and then started crackling, I would suggest getting a wooden chopstick and poking around the amp while it's running with a pair of cheap headphones plugged in so you can hear if there's a specific joint or region of the circuit causing the issue.  It would also be a good idea to describe the noise, is it totally random or periodic?