Recent content by Richard_C

@tapetech thank you for all the information, I truly appreciate all your help and patience and I apologize for my lack of knowledge.

@tapehead you rock!! Another stupid question: do I need to buy the calibration tapes or can I do that using the tone generator on the PC instead? Also when you refer to VU's, how can I be sure that I am at the right level? Can that be adjusted using the deck's level indicators? For now I am...

400 hz 0vu "source": 400 hz 0vu "tape: 400 hz +5vu "source": 400 hz +5vu "tape": I am also adding a video, for 0vu in "tape" monitoring so you can see the bouncing of the signals.

I can buy a new cassette but I am using some with very little use. The back tension belt is brand new. I have not calibrated anything. I am not sure if I have the skills and equipment to do it. I only have the cheap DMM and the PC with the software scope. I am using a Behringer UCA202 to...

Attached is a screen recording of the oscilloscope showing the signal from the output jacks of the deck. The recording is a 5khz tone generated by the oscilloscope fed into the deck via the Input jacks. I am attaching the "source" screen capture where you can see the imbalance, but I careless...

Distortion is the main issue. The imbalance I only noticed it in the scope, I don't think it is audible. The recordings (specially with Type 1) sound like saturated and distorted. With type 4 it is hard to spot, but very noticeable in some passages of different songs. I will upload a fragment of...

Hi @tapehead , Thank you again for your guidance. These measurement was done feeding a 400hz tone to the deck and connecting the output to the PC running Visual Analyser. 1) The first thing I noticed is not really distortion but I would like to understand where the difference between the two...

The home plug is that device that uses the home power lines for computer network traffic. Mine are Netgear PWL1000. As soon as I have the distortion data I will post again.

@tapehead now I am pretty sure you will get mad at me. How could I imagine. That noise comes from.....the Internet home plug! The noise problem is SOLVED!!!! Now the second chapter is the distortion. I am already collecting data, more to come on that. To all the AK members who took time and...

BTW, I connected the deck to a a software oscilloscope on my PC, and I see that the noise is present in both channels at the same time. So I presume (without knowing anything about electronics) that whatever circuit is failing, it has to be common for both channels. EDIT: I just noticed that...

thank you @tapetech! How do I measure BM-17 without burning my house? Meaning, where do I place the probes? Sorry I am a rookie on this matters....

Hi @tapetech ! I did my best to measure all connectors to ground. Please see the attached document. The ones in yellow do not measure to ground but I think those are acceptable. There are two highlighted in red that where the ground connection is sitting behind capacitors and I am also not sure...

The Q205 out circuit measured 0.7v B to C and 0.7v B to E. It is open all other directions so I think it is good. I put it back in place. It measures +3v on E, +6v on C and 0v on B. The D203 reads .6v in one direction and it is open on the other direction so I think it is also good. My friend...

Hi @tapetech ! Don't get mad at me, but If both should measure +6.20v then Q205 must have a problem as it measures +3v. So....I just desoldered it, see picture. The track has lifted but I think it is fixable? What are the specs for Q205? I can't find it in the SM....

Not sure it is a smoking gun, but with the deck turned on, Q205's emitter measures +3.05V and Q204's emitter measures +6.20V. Should both read +6.20V with respect to ground?