Hi, just been through the resistance and voltage checks on my Bee Pre build... Unfortunately the figures don't look quite right:
Resistance check appears close with:
A4 and B1 looking low
A1 and B4 looking high
10 and 15 falling rather than rising
27, 32, 39 looking high at 0.9v but that may be within the margin of error as most my 0's for resistance were actually showing 0.4
Voltage check appears further out with:
T6, T11, C / D 3, C / D 7, C / D 9 all appearing on the low side
It feels like I may have made the same mistake on both sides...
When I did run some audio through it to a solid state amp it sounded muffled with a lot of the high end missing...
Anyway, any advice at this point would be much appreciated... I will likely be reworking all the solder points on the circuit boards later today...
Line Voltage: 248.5
Tubes: EH 300b
All tubes light up...
My kit was short the R3 143K 0.5 W metal film resistors for the regulator boards and I have substituted a pair of 100K 0.6W and 43K 0.6W (soldered in series) in place of each as an interim measure until I get a local replacement.
Resistance:
Terminal Manual BeePre
1 High dropping to 4 4.4
2 Greater than 100K (OL) 288k
3 0 0.4
4 5-6 with 300b in socket, * 5.6
5 0 0.4
6 more than 30k 49.9
7 470k 473
8 0 0.4
9 0 0.4
10 starts low, rises to 20K+ *** starts high and falls to 20k+ ***
11 more than 30K 50.4
12 470K 473
13 0 0.4
14 0 0.4
15 starts low, rises to 20K+ *** starts high and falls to 20k+ ***
16 starts high, drops to 4 4.6
17 greater than 100K (OL) 282k
18 0 0.4
19 5-6 with a 300b in socket, * 5.6
20 0 0.5
21 0 0.5
22 greater than 100K (OL) 282k
23 0 0.4
24 0 0.4
25 greater than 100K (OL) 100k+
26 0 0.4
27 0 0.9
28 0 0.5
29 * *
Terminal Manual BeePre
30 * *
31 * *
32 0 0.9
33 0 0.5
34 * *
35 * *
36 * *
37 0 0.5
38 0 0.5
39 0 0.9
40 greater than 100K (OL) 100k+
41 0 0.5
42 0 0.5
43 greater than 100K (OL) 100k+
44 0 0.4
45 0 0.5
46 greater than 100K (OL) 100k+
47 N/A N/A
48 stablise to 603 603
49 0 0.4
50 N/A N/A
51 stabilise to 603 604
A1 starts high, drops to 4 5.5
A2 greater than 100k (OL) 282
A3 varies with volume / balance 0 to 50 16.6k
A4 5-6 with 300b in socket 4.3
B1 5-6 with 300b in socket 4.4
B2 greater than 100k (OL) 280
B3 varies with volume / balance 0 to 50 16.3k
B4 starts high, drops to 4 5.5
Terminal Manual BeePre
C1 N/A N/A
C2 215 213
C3 OL 545
C4 greater than 100 greater
C5 greater than 100 greater
C6 N/A N/A
C7 more than 30k 49.3
C8 N/A N/A
C9 more than 30k 49.6
D1 N/A N/A
D2 215 215
D3 OL 545
D4 greater than 100 greater
D5 greater than 100 greater
D6 N/A N/A
D7 more than 30k 50k
D8 N/A N/A
D9 more than 30k 50k
Voltage:
Terminal Manual BeePre
1 5v 4.95v
2 90-110v 102
3 0v 0
4 9.85v 9.73
5 0v 0
6 146v 103v
7 0v 0
8 0v 0
9 0v 0
10 186v 189.8
11 146v 93.7
12 0v 0
13 0v 0
14 0v 0
15 186v 189.1
16 5v 4.95v
17 90-110v 91.5
18 0v 0
19 9.85v 9.75
20 0v 0
21 0v 0
22 213v 216
23 0v 0
24 0v 0
25 213v 216
26 0v 0
27 0v 0
28 0v 0
29 6.8v 6.8
Terminal Manual BeePre
30 6.8v 6.8
31 13.6v 13.6
32 0v 0
33 0v 0
34 13.6v 13.6
35 6.8v 6.8
36 6.8v 6.8
37 0v 0
38 0v 0
39 0v 0
40 213v 216
41 0v 0
42 0v 0
43 213v 215
44 0v 0
45 0v 0
46 213v 215
47 N/A 0
48 0v 0
49 0v 0
50 N/A 0
51 0v 0
Terminal Manual BeePre
A1 Risky Not Measured
A2 90-110v 98
A3 0v 0
A4 Risky Not Measured
B1 Risky Not Measured
B2 90-110v 91
B3 0v 0
B4 Risky Not Measured
Terminal Manual BeePre
C1 N/A
C2 0
C3 3.5-4.5v 0.75 measured on 20v setting
C4 N/A
C5 N/A
C6 N/A
C7 147v 101.1v
C8 N/A
C9 147v 100.4v
D1 N/A
D2 0 0
D3 3.5-4.5v 0.75 measured on 20v setting
D4 N/A
D5 N/A
D6 N/A
D7 147v 93.3v
D8 N/A
D9 147v 92.6v
Ignore the additional selector switch you see in the photos - that is not currently connected to anything and is a placeholder for a future upgrade to switch outputs...
Thanks,
Bill
