I am a bit confused about something in the manual.
1) Reproduce level Adjustment: Connect multimeter to output. Manual states play MRL for level. Adjust pot on card for Ref level 4dBm 1.23V. I'm assuming that I want 4dBm to equal 0VU. My first question is doesn't the Reproduce level pot next to the VU affect this? When I want to setup my 250nWb test tape for higher output (-3VU) how does that come into play?
Should the ref level button be in or out when adjusting the pot on the cards?
2) Freq Response Test: The manual states Play MRL 15kHz."the level of this section is approx 10dB lower than in the ref section." "Connect multimeter adjust Treble pot for optimum freq response (relative to ref level -10dB)."The Bass section states the same thing. What does it mean when it states -10dB relative to level section? What measurement on the multimeter or where on the VU do I set it? I thought I lined this up to where I set the 1K tone, in my case -3VU.
Studer B67 Alignment ?
2I can't help with question 1 since I'm not intimately familiar with the machine, but question 2 refers to the fact that some MRL tapes have their HF and LF response sections recorded at -10dB from the reference level, which is the level that your 500Hz/1kHz tone is recorded at.
This means that if you play back the tape on a perfectly set up machine where the reference level on the tape equates to 0VU, the high and low tones will read -10VU. So if you want to set up the machine for a higher operating level, you'd set the 1kHz tone at -3VU and the 10kHz/100Hz at -13VU.
Check the part number of your MRL tape on their website though, because not all tapes are done that way. Both of mine have all tones printed at reference level.
This means that if you play back the tape on a perfectly set up machine where the reference level on the tape equates to 0VU, the high and low tones will read -10VU. So if you want to set up the machine for a higher operating level, you'd set the 1kHz tone at -3VU and the 10kHz/100Hz at -13VU.
Check the part number of your MRL tape on their website though, because not all tapes are done that way. Both of mine have all tones printed at reference level.
Studer B67 Alignment ?
3[quote="oldsoulsound"]I am a bit confused about something in the manual.
1) Reproduce level Adjustment: Connect multimeter to output. Manual states play MRL for level. Adjust pot on card for Ref level 4dBm 1.23V. I'm assuming that I want 4dBm to equal 0VU. My first question is doesn't the Reproduce level pot next to the VU affect this? When I want to setup my 250nWb test tape for higher output (-3VU) how does that come into play?
Should the ref level button be in or out when adjusting the pot on the cards?
I use this machine ona regular basis.
the reproduce knobs next to the VUs are for adjusting the output outside of the fixed calibration. You should align the machine with the "uncal" buttons found next to those knows in the out position, which takes the knobs out of the circuit (ie fiddling with the nkobs will not affect your output). The "uncal" button is useful for aligning your bias, for reducing or bossting your output for special circumstances, or anytime you need to adjust the output without taking the machine out of alignment.
If you have a 250 nWb/m test tape, and want to align the machine to record at +3dB above that (355 nWb/m), you need to align your repro so that your tones read -3 dBvu. Then when you align the record section, set your record levels to 0dBvu. That means you are record at 3 dB over your test tape.
great machine btw, i love mine to tears.
1) Reproduce level Adjustment: Connect multimeter to output. Manual states play MRL for level. Adjust pot on card for Ref level 4dBm 1.23V. I'm assuming that I want 4dBm to equal 0VU. My first question is doesn't the Reproduce level pot next to the VU affect this? When I want to setup my 250nWb test tape for higher output (-3VU) how does that come into play?
Should the ref level button be in or out when adjusting the pot on the cards?
I use this machine ona regular basis.
the reproduce knobs next to the VUs are for adjusting the output outside of the fixed calibration. You should align the machine with the "uncal" buttons found next to those knows in the out position, which takes the knobs out of the circuit (ie fiddling with the nkobs will not affect your output). The "uncal" button is useful for aligning your bias, for reducing or bossting your output for special circumstances, or anytime you need to adjust the output without taking the machine out of alignment.
If you have a 250 nWb/m test tape, and want to align the machine to record at +3dB above that (355 nWb/m), you need to align your repro so that your tones read -3 dBvu. Then when you align the record section, set your record levels to 0dBvu. That means you are record at 3 dB over your test tape.
great machine btw, i love mine to tears.
Studer B67 Alignment ?
4Thanks guys this is helpfull. I checked with MRL and they said there tones are all at 0VU. I still have a couple of questions regarding the setup.
1) The manual states to set up the output for CCIR at 1.55V which I believe is +6dB. Shouldn't I be setting it up for +4dB or 1.23V? Is this different because I am using CCIR and not NAB?
2) When making adjustments on the record amp is states to start with a preadjustment using the level pots on the cards. Why not the preadjust pots on the cards? It doesn't even mention using the preadjust pot until you get to the NAB setup instructions which seems to be for the VU meter calibration. So for CCIR I am using the same level pot for pre and final adjusting. Does this make sense?
3) For Bias it wants a 10kHz signal 20dB down from ref level. And for High Freq adjusting a 15K signal again 20dB down from ref level. 20dB down seems like a lot. Does this seem correct? If so why?
1) The manual states to set up the output for CCIR at 1.55V which I believe is +6dB. Shouldn't I be setting it up for +4dB or 1.23V? Is this different because I am using CCIR and not NAB?
2) When making adjustments on the record amp is states to start with a preadjustment using the level pots on the cards. Why not the preadjust pots on the cards? It doesn't even mention using the preadjust pot until you get to the NAB setup instructions which seems to be for the VU meter calibration. So for CCIR I am using the same level pot for pre and final adjusting. Does this make sense?
3) For Bias it wants a 10kHz signal 20dB down from ref level. And for High Freq adjusting a 15K signal again 20dB down from ref level. 20dB down seems like a lot. Does this seem correct? If so why?