Charlie actually can take head bump out with a resistor as he did in my unit.
And tapes that were recorded on units that exhibit bumps at different frequencies and amplitudes, you do what? Of course you only play at 15ips, correct?
Charlie actually can take head bump out with a resistor as he did in my unit.
And tapes that were recorded on units that exhibit bumps at different frequencies and amplitudes, you do what? Of course you only play at 15ips, correct?
So how would the UHA deck be any better in this regard? I thought that was what Christian was talking about. That goes back to the post by JZDA that the best sounding machine is one that's properly aligned.
As far as speed, yes only 15ips.
You need to answer my question Myles as it was directed to you, not to or about Christian's machine.
How is this "resistor" going to correct for head bump at different frequencies and amplitudes from tapes that were recorded on a hundred different machines?
Of concern is also how aftermarket switchable eq repro amps deal with the low freq differences between NAB and IEC curves : IEC has no eq at LF while NAB has a 20db boost starting at 50Hz carrying on downwards ad infinitum. In effect freqs below 250Hz are already boosted. Some manufacturers ignore the effects at LF and only switch for the HF causing overbearing bass on IEC tapes
Gentlemen
I do believe you are arguing about different diseases here:
"Head Bump" is a playback only phenomenon that occcurs by interaction between the physical properties of the Playback head and the recorded signal.It is not a recording phenomenon.
The troublesome overbearing bass experienced by those using outboard repro amps may well be due to this.It is also a reason to argue against the use of universal repro amps as the bump is specific for each type of head. Hence the resistor fix for Myles' Nortronics heads(remember the Cello electronics were exclusively design for the Studer A 820) will be a disaster for X or Ys Woelke or FM or whatever.
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That's right... and the recorded signal is different depending on what playback head you use to calibrate/monitor. That's why test tones are on tapes (hopefully) so you can do LF calibration depending on what machine it was recorded on and how it was set up.
Jack Endino posted how 10 machines can have 10 different freq/amplitude headbumps. Now you have to compensate for that somehow when duping from tapes recorded on 10 different machines! Otherwise, you would not need test tones on tapes... just set every machine with an MRL tape.
Gentlemen
I do believe you are arguing about different diseases here:
"Head Bump" is a playback only phenomenon that occcurs by interaction between the physical properties of the Playback head and the recorded signal.It is not a recording phenomenon.
The troublesome overbearing bass experienced by those using outboard repro amps may well be due to this.It is also a reason to argue against the use of universal repro amps as the bump is specific for each type of head. Hence the resistor fix for Myles' Nortronics heads(remember the Cello electronics were exclusively design for the Studer A 820) will be a disaster for X or Ys Woelke or FM or whatever.
According to Jay McKnight there are three reasons for bumps in playback;(1) Headbump, we dealt with (2) Tape Fringing ,which is really only a calibration tape phenomenon and (3) indifferent equalisation during recording which is likely to be the one that has Bruce tearing his hair out. We only have to look at the weird way in which the NAB curve addresses low frequencies to realise the difficulty in putting Humpty Dumpty together again 30-40 years after the fact.
Of concern is also how aftermarket switchable eq repro amps deal with the low freq differences between NAB and IEC curves : IEC has no eq at LF while NAB has a 20db boost starting at 50Hz carrying on downwards ad infinitum. In effect freqs below 250Hz are already boosted. Some manufacturers ignore the effects at LF and only switch for the HF causing overbearing bass on IEC tapes
Then at High Frequencies there are such delights as head gap compensation,cable capacitance compensation etc that makes one want to leave a stock machine... well stock.
As most of my tapes are IEC, that is what I am experiencing with them. Bass that is a bit overbearing.
You need to answer my question Myles as it was directed to you, not to or about Christian's machine.
How is this "resistor" going to correct for head bump at different frequencies and amplitudes from tapes that were recorded on a hundred different machines?
On all of them? If I'm reading Bruce correctly, this phenomena should vary from tape to tape.
Didn't Mark use his module with the A80 too eg. the ML5?
As far as modding question goes. I think that people like Charlie and Nick go and check the decks FR. IIRC, Charlie also uses a HF trim in his unit.
A billion apologies to Rockitman for totally derailing his thread. Consider it punishment for abandoning an A80 for a Teac, of all things!:b
That's right... and the recorded signal is different depending on what playback head you use to calibrate/monitor. That's why test tones are on tapes (hopefully) so you can do LF calibration depending on what machine it was recorded on and how it was set up.
Would Nortronics be considered "very high quality"?
Would Nortronics be considered "very high quality"?
AFAIK their "professional" and "semi-professional" heads are the only ones currently sold?Their standard line of replacement heads were never considered "very high quality" or "state of the art" at all. However, I have heard reports that they did make a line of higher-end "professional" heads. I have no experience with those. Certainly possible they work and sound fine (or, with some adjustments to the playback amp, work and sound fine).
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