Today I it was time to give the Beogram 4002 (5513) that I am currently reviving a properly adjusted platter and sub chassis. The goal is to adjust everything that the aluminum surface of the platter is flush with the aluminum panels surrounding it, while having the sub chassis centered between the upper and lower limits of the transport locks and the arms being also parallel to the aluminum surfaces. This is usually a pretty delicate process since so many things need to align. I have now a bit of experience with this and so after a while this Beogram looked very nice and up to spec. I recently made a couple videos that demonstrate this process:
Once the platter was adjusted I did a baseline RPM adjustment for 33.33 and 45 RPM using my recently developed BeoloverRPM device. Here is a picture of it in action:
This shows the readout after I already had adjusted 33.33 and then did 45:
| Stabilizing | |||
| Measurement | starts | ||
| time: | 0:0:9 | RPM: | 33.381 |
| time: | 0:0:20 | RPM: | 33.3782 |
| time: | 0:0:31 | RPM: | 33.3904 |
| time: | 0:0:42 | RPM: | 33.3987 |
| time: | 0:0:53 | RPM: | 33.4052 |
| time: | 0:1:4 | RPM: | 33.3937 |
| time: | 0:1:15 | RPM: | 33.4039 |
| time: | 0:1:26 | RPM: | 33.3882 |
| time: | 0:1:37 | RPM: | 33.3958 |
| time: | 0:1:48 | RPM: | 33.3817 |
| time: | 0:1:59 | RPM: | 33.3982 |
| time: | 0:2:10 | RPM: | 33.4025 |
| time: | 0:2:21 | RPM: | 33.4117 |
| time: | 0:2:32 | RPM: | 33.4088 |
| time: | 0:2:43 | RPM: | 33.3933 |
| time: | 0:2:54 | RPM: | 33.3916 |
| time: | 0:3:5 | RPM: | 33.3879 |
| time: | 0:3:16 | RPM: | 33.3815 |
| time: | 0:3:27 | RPM: | 33.4003 |
| time: | 0:3:38 | RPM: | 33.4095 |
| time: | 0:3:49 | RPM: | 33.4057 |
| time: | 0:3:54 | RPM: | 35.24 |
| time: | 0:3:55 | RPM: | 38.32 |
| time: | 0:3:56 | RPM: | 40.9 |
| time: | 0:4:0 | RPM: | 44.4733 |
| time: | 0:4:11 | RPM: | 44.8362 |
| time: | 0:4:22 | RPM: | 44.8325 |
| time: | 0:4:33 | RPM: | 44.8564 |
| time: | 0:4:44 | RPM: | 44.8543 |
| time: | 0:4:55 | RPM: | 45.0447 |
| time: | 0:5:6 | RPM: | 45.1634 |
| time: | 0:5:17 | RPM: | 45.1921 |
| time: | 0:5:28 | RPM: | 45.1968 |
| time: | 0:5:39 | RPM: | 44.8451 |
| time: | 0:5:50 | RPM: | 44.8174 |
| time: | 0:6:1 | RPM: | 45.2279 |
| time: | 0:6:12 | RPM: | 45.2203 |
| time: | 0:6:23 | RPM: | 44.7694 |
| time: | 0:6:34 | RPM: | 45.1452 |
| time: | 0:6:45 | RPM: | 45.2124 |
| time: | 0:6:56 | RPM: | 45.1949 |
| time: | 0:7:7 | RPM: | 45.1759 |
| time: | 0:7:18 | RPM: | 45.1953 |
| time: | 0:7:29 | RPM: | 45.2055 |
| time: | 0:7:40 | RPM: | 45.1998 |
It turns out that it is pretty difficult to adjust the RPM precisely with the standard single turn RPM trimmers that are in the Beogram originally. You can see at the and how I tried to get close to 45, but I always missed it by 0.2 or more by just very slightly moving the trimmer. This demonstrates that it is a great idea to put in multi-turn trimmers to get this right. On the other hand, I think it is difficult to hear such small difference...so this deck sounds now pretty good, especially with the lovely MMC20CL cartridge that came with it. I am listening to 'Song for My Father' by Horace Silver on Blue Note on it right now while writing this post! Wonderful!
I will give this Beogram some more listening to make sure there are no intermittent issues, but I think it is ready for duty again. This is Beolove!
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