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Recent Posts
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Pipette Speaker / New Pipette Build
« Last post by benzxc on April 21, 2024, 04:42:43 PM »Here is a photo of my Pipette build.
It was a a lot of fun; about two to three hours of assembly time. The only minor issue that I encountered was the connector between the drivers and the binding posts. The connector did not fit very well with them and I am constantly worried about them falling off the spades of the binding posts or off the drivers. I may need to use pliers or something to get them to fit better.
Very fun project and they look fantastic. I am driving them with Stereomour at 8ohms; remember reading somewhere that Doc recommends using the 4ohms. May do that down the road but I am enjoying what is coming out right now.
It was a a lot of fun; about two to three hours of assembly time. The only minor issue that I encountered was the connector between the drivers and the binding posts. The connector did not fit very well with them and I am constantly worried about them falling off the spades of the binding posts or off the drivers. I may need to use pliers or something to get them to fit better.
Very fun project and they look fantastic. I am driving them with Stereomour at 8ohms; remember reading somewhere that Doc recommends using the 4ohms. May do that down the road but I am enjoying what is coming out right now.
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Kaiju Stereo 300B amp / Re: driver testing
« Last post by Paul Birkeland on April 21, 2024, 03:12:39 PM »Both B side Kreg voltage indicate saturation, which would make me very, very interested in seeing the bottom of each C4S PC board. I would wonder if there are solder bridges present between pins on some of the transistors that got swapped around.
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Kaiju Stereo 300B amp / Re: driver testing
« Last post by joralieu on April 21, 2024, 02:24:37 PM »Socket A Socket D
Kreg A 4.1. Kreg A .06
Kreg B 1.8. Kreg B 1.8
Kreg A 4.1. Kreg A .06
Kreg B 1.8. Kreg B 1.8
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Kaiju Stereo 300B amp / Re: driver testing
« Last post by Paul Birkeland on April 21, 2024, 10:18:19 AM »What are you Kreg voltages?
Even if not powered up, reworking these boards can be tough. Still, you have the exact same problem on both boards, so the same error is likely present on both sides.
Even if not powered up, reworking these boards can be tough. Still, you have the exact same problem on both boards, so the same error is likely present on both sides.
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BeePre / Re: Resistance Check at 26
« Last post by Paul Birkeland on April 21, 2024, 10:17:28 AM »1. C2, D2 ==> Expected was 215ohm but Observed = 429ohmWhat resistance reading to do you get at the center post of each 9 pin socket? Those resistance readings should be 0 ohms and there's a 215 ohm resistor from the center post to C2 and another to D2. These should be dead nuts on.
4. 21 ==> Expected was 0 ohm but observed = 0.6 ohm21, 26, 33, and 38 will all connect together through the power transformer cover. If you see the correct resistance reading at 38 but not at 21, 26, and 33, then either you do not have the power transformer hardware installed properly or the hardware isn't tight enough. The same goes for 27, 32, 39, and 44.
5. 26 ==> Expected was 0 ohm but observed = fluctuating 70-100kohm
6. 32 ==> Expected was 0 ohm but observed = 0L
7. 33 ==> Expected was 0 ohm but observed = 0L
The resistance values you posted on the 4 pin sockets for 1 and 4 are sufficiently close to what we are looking for that I wouldn't worry too much about them.
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BeePre / Re: Resistance Check at 26
« Last post by hpleung on April 21, 2024, 07:40:45 AM »Thanks. ok interesting. So I need to know which resistance check values I can ignore before i plug in the power.
I plugged in all tubes.
Here are those resistance checks where they don't match, can you tell me if that is ok to ignore like in 26?
1. C2, D2 ==> Expected was 215ohm but Observed = 429ohm [This is the biggest mismatch]
2. A1 ==> Expected was 4 ohm but observed = 5 ohm
3. A4 ==> Expected was 5 to 6 ohm but observed = 4.4 ohm
4. 21 ==> Expected was 0 ohm but observed = 0.6 ohm
5. 26 ==> Expected was 0 ohm but observed = fluctuating 70-100kohm
6. 32 ==> Expected was 0 ohm but observed = 0L
7. 33 ==> Expected was 0 ohm but observed = 0L
The full list below:
Expected Observed
1 4 4.5
2 >100kohm 390kohm
3 0 0.3
4 5 to 6 5.6
5 0 0.3
6 >30kohm 145 kohm
7 470kohm 470.5kohm
8 0 0.3
9 0 0.3
10 20kohm 1.8mega ohm
11 >30kohm 145kohm
12 470kohm 468kohm
13 0 0.3
14 0 0.3
15 >20kohm 12 mega ohm
16 4 4.3
17 100 kohm 388kohm
18 0 0.3
19 5 to 6 5
20 0 0.3
21 0 0.6
22 >100k ohnm 15 mega ohm
23 0 0.3
24 0 0.3
25 >100k ohnm 2.7 mega ohm
26 0 Fluctuating 70-100 kohm
27 0 0.4
28 0 0.3
29 * 600 fluctuating
30 * fluctuating
31 * fluctuating
32 0 0L
33 0 0L
34 * ok
35 * ok
36 * ok
37 0 0.3
38 0 0.3
39 0 0.3
40 >100k 20mega
41 0 0.3
42 0 0.3
43 >100k ok
44 0 0.3
45 0 0.3
46 >100k ok
47 N/A OL
48 603ohm 607
49 0 0.3
50 N/A 0L
51 603 604
A1 4 5
A2 >100 3790kohm
A3 0-50kohm 1.52 ohm
A4 5-6ohm 4.4
B1 5 to 6ohm 4.3
B2 >100kohm 2 mega
B3 0 to 50 1.5kohm
B4 4 5
C1, D1 N/A 0L
C2, D2 215ohm 429
C3, D3 0L 0L
C4, D4 >100ohm 0.8 mega
C5, D5 >100ohm 0L
C6, D6 N/A 0L
C7, D7 >30kohm 290kohm
C8, D8 N/A 0L
C9, D9 >30kohm 290kohm
I plugged in all tubes.
Here are those resistance checks where they don't match, can you tell me if that is ok to ignore like in 26?
1. C2, D2 ==> Expected was 215ohm but Observed = 429ohm [This is the biggest mismatch]
2. A1 ==> Expected was 4 ohm but observed = 5 ohm
3. A4 ==> Expected was 5 to 6 ohm but observed = 4.4 ohm
4. 21 ==> Expected was 0 ohm but observed = 0.6 ohm
5. 26 ==> Expected was 0 ohm but observed = fluctuating 70-100kohm
6. 32 ==> Expected was 0 ohm but observed = 0L
7. 33 ==> Expected was 0 ohm but observed = 0L
The full list below:
Expected Observed
1 4 4.5
2 >100kohm 390kohm
3 0 0.3
4 5 to 6 5.6
5 0 0.3
6 >30kohm 145 kohm
7 470kohm 470.5kohm
8 0 0.3
9 0 0.3
10 20kohm 1.8mega ohm
11 >30kohm 145kohm
12 470kohm 468kohm
13 0 0.3
14 0 0.3
15 >20kohm 12 mega ohm
16 4 4.3
17 100 kohm 388kohm
18 0 0.3
19 5 to 6 5
20 0 0.3
21 0 0.6
22 >100k ohnm 15 mega ohm
23 0 0.3
24 0 0.3
25 >100k ohnm 2.7 mega ohm
26 0 Fluctuating 70-100 kohm
27 0 0.4
28 0 0.3
29 * 600 fluctuating
30 * fluctuating
31 * fluctuating
32 0 0L
33 0 0L
34 * ok
35 * ok
36 * ok
37 0 0.3
38 0 0.3
39 0 0.3
40 >100k 20mega
41 0 0.3
42 0 0.3
43 >100k ok
44 0 0.3
45 0 0.3
46 >100k ok
47 N/A OL
48 603ohm 607
49 0 0.3
50 N/A 0L
51 603 604
A1 4 5
A2 >100 3790kohm
A3 0-50kohm 1.52 ohm
A4 5-6ohm 4.4
B1 5 to 6ohm 4.3
B2 >100kohm 2 mega
B3 0 to 50 1.5kohm
B4 4 5
C1, D1 N/A 0L
C2, D2 215ohm 429
C3, D3 0L 0L
C4, D4 >100ohm 0.8 mega
C5, D5 >100ohm 0L
C6, D6 N/A 0L
C7, D7 >30kohm 290kohm
C8, D8 N/A 0L
C9, D9 >30kohm 290kohm
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Kaiju Stereo 300B amp / Re: driver testing
« Last post by joralieu on April 21, 2024, 06:58:11 AM »They were all in the right place but I had the flat sides facing the wrong way. I corrected that before It was powered up.
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BeePre / Re: Resistance Check at 26
« Last post by Paul Birkeland on April 21, 2024, 06:18:21 AM »Oh, you have a BeePre 1, that changes things a bit. You can completely ignore what's going on at terminal 26 in a BeePre 1. Not having 0 ohms here may just be a matter of having slightly loose hardware, but that on its own isn't going to cause and problems.
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BeePre / Re: Resistance Check at 26
« Last post by hpleung on April 21, 2024, 06:08:22 AM »I did search for 26, 26L and 26U from the pdf and did not find any instructions to wire a black wire