Wired the ICs and when checking the work found pins on IC1 & IC2 showing continuity on terminals 2 & 3, (A & K). There is no solder bridging the terminals on the board for sure.
I got a spare pair and those are showing continuity as well. Is this normal, are the ICs fake /busted or is this expected ?
I got a spare pair and those are showing continuity as well. Is this normal, are the ICs fake /busted or is this expected ?
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TSE-II (300B) - replacement for IC1 & IC2 - DN2540
Been through the various threads and DN2540 is the recommended replacement. Am I right in understanding R16 & R27 have to change - 180R.
George post from the TSE thread. Can you please help confirm ? Does carbon comp here make a difference ?
10m45s
Been through the various threads and DN2540 is the recommended replacement. Am I right in understanding R16 & R27 have to change - 180R.
George post from the TSE thread. Can you please help confirm ? Does carbon comp here make a difference ?
10m45s
Attachments
I measured some new, known good 10M45's and also see "continuity" between A and K, so this appears to be normal. The readings are slightly different when the probes are swapped, and vary depending on which meter I use.
A carbon comp resistor is not needed on the 10M45.
The only place a CC resistor seems to be needed is on the grid of the 5842. Some people report that a carbon film or metal film resistor works on the grid, but I have seen some tubes oscillate with a metal film resistor.
I started building my TSE-II about 2 weeks ago. I have it working now on a piece of plywood on my Klipsch Cornwall speakers and have to say it sounds really good, so very happy with the result so far.
I tried to use transformers that I allready had and ended up with an AE power transformer running off the 300-0-300 taps and combined with a Philips choke that measures 7H and a DCR of 27 ohms gives a B+ of about 375V +/- 4V depending on the line voltage.
I had to use a separate 5V transformer, because there was no 5V tap. It puts out AC 5.5V so I had to put a 0.22 ohm resitor in to get it to 5.08V, need to find a slightly larger resitor.
I have the 300B tubes set at about 62 mA, not sure if I should try raising this a bit more.
Output transformer are also from AE, but a bit of a mystery. They are probably 5K and 50W according to AE, but they can not be 100% sure because these do not have an AE part number they can look up. Primary connections are labeled 0 (B+) and V g2, so thats weird. They make the big Edcor opt's I have on my SSE look small.
The only small issue I had was that the filaments of the 5842 tubes only got 5.82V. I found an old thread and it suggested lowering R3. I now have 1.5 Ohm in there and the voltage went up to between 6.1 or 6.2V. I will try a 1.3 or 1.4 ohm resitor later, but for now it's good enough.
Still need to make a case, but that may take some time because I am stil playing the amp now. It will be a very heavy amp since everything is a bit oversized.
I tried to use transformers that I allready had and ended up with an AE power transformer running off the 300-0-300 taps and combined with a Philips choke that measures 7H and a DCR of 27 ohms gives a B+ of about 375V +/- 4V depending on the line voltage.
I had to use a separate 5V transformer, because there was no 5V tap. It puts out AC 5.5V so I had to put a 0.22 ohm resitor in to get it to 5.08V, need to find a slightly larger resitor.
I have the 300B tubes set at about 62 mA, not sure if I should try raising this a bit more.
Output transformer are also from AE, but a bit of a mystery. They are probably 5K and 50W according to AE, but they can not be 100% sure because these do not have an AE part number they can look up. Primary connections are labeled 0 (B+) and V g2, so thats weird. They make the big Edcor opt's I have on my SSE look small.
The only small issue I had was that the filaments of the 5842 tubes only got 5.82V. I found an old thread and it suggested lowering R3. I now have 1.5 Ohm in there and the voltage went up to between 6.1 or 6.2V. I will try a 1.3 or 1.4 ohm resitor later, but for now it's good enough.
Still need to make a case, but that may take some time because I am stil playing the amp now. It will be a very heavy amp since everything is a bit oversized.
Attachments
Hi Debije, hows the heat on the regulator and R36. My PS and choke is similar (310-0-310) and 7H (~80R though) , just wondering what you're getting. Is the 6.5w on R36 enough? I have a 10W cement resistor (white coffin) there.
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