|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
38.118.25.194
In Reply to: RE: Can I? posted by tesla on February 15, 2016 at 10:39:04
Does it have a tape head option on the input switch (phono gain without the RIAA equalization). If so it should work without any modifications. If you do need to modify, make sure it is reversible. A 22 should fetch a pretty penny in stock form, and as you link points out, Bottlehead has a kit. Modifications can make a valuable piece worthless as I found out the hard way with a CJ PV-3.
Dave
Follow Ups:
I was going through this thread and the discussion about the playback curve. The playback speeds seemed peculiar to me as the "Tape Project" tapes are 15 IPS.
Just sayin'
From Doc B
"The basic requirements of a reel to reel machine for Tape Project tape playback are:
handles 10.5" reels
plays at 15 ips
has 1/4" half track stereo (a.k.a. two track) playback head
has IEC (a.k.a. CCIR) playback equalization"
Hi Uncle Mike,
I should probably read that since I have 4 reel-to-reel decks. I have a TEAC, a Tandberg and Knight (tube with separate preamplification/switching section) and a United Stereo Tapes UST-4 (tube, home version made by Ampex). I have a small collection of prerecorded reels which are mostly classical. It would be nice to hear them at there best. The TEAC and the UST work, but both could use some restoration.
Dave
I remember reading that now, and going by that, the Rs-1500 is obviously a good candidate, except it is in stock form only NAB. I guess they mod them, I wish I knew how, I would like to do mine.
Proudly serving content-free posts since 1984.
Thanks for the info.It's rather obvious that any "vintage" preamp, with tape head I/Ps requires modification, if media purchased from "The Tape Project" is to be played. Both the 15 IPS tape speed and the EQ curve used must be taken into account.
Clearly Doc B. is the go to guy, for getting the modifications (if undertaken) done correctly.
Eli D.
Edits: 02/16/16
Yes, the Quad II has a tape input.
Eli, how do you know the EQ is for 3.75 ips? (I don't have the owners manual).
Proudly serving content-free posts since 1984.
I will differ to Eli on this one (see answer below), who obviously knows more than me on this. From Eli's answer it looks like you'd have to modify. My main message is that if you do so, do so carefully. You don't want to ruin the value of the Quad.
Dave
Ok, Eli and Dave,If this preamp has a tape input, (and it most certainly does), then at 7.5 IPS it should be fine as is. However, if I wanted to use some other speed, then some EQ adjusting would be in order.
Or am I missing something?
Proudly serving content-free posts since 1984.
Edits: 02/16/16
"If this preamp has a tape input, (and it most certainly does), then at 7.5 IPS it should be fine as is."
IF the tape being played was recorded according to the NAB standard, it will work, within whatever accuracy Leak achieved. OTOH, the tapes sold by "The Tape Project" are recorded using a different curve, that may very well have technical advantages over the many decades old NAB curve.
You will have to modify the preamp to use media purchased from "The Tape Project", even if the tape speed is 7.5 IPS.
BTW, tape deck playback head impedance matters, very much, too.
Eli D.
Not bring picky, but it's a Quad, not a Leak.
Some good points, nonetheless.
Proudly serving content-free posts since 1984.
It's a few "simple" passive parts changes to make the modifications. However, you are 100% correct about making damned sure any mods. made can be COMPLETELY reversed, should a future sale be contemplated.
Eli D.
The EQ is for 7.5 IPS , as that's what the consumer equipment of the day used. Some machines could do both 7.5 IPS and 3.75 IPS, but 3.75 IPS was regarded as being inadequate for full range HIFI.
FWIW, I can tell you from personal experience that 3.75 IPS was OK recording (sic) AM radio.
Eli D.
Dave,
Tape head has equalization. It's the NAB, as opposed to RIAA, curve. "Vintage" equipment with that option works with a deck running at 7.5 IPS. The EQ poles change, when the tape speed drops to 3.75 IPS and 1.875 IPS (as found in cassette decks).
Also, pre-recorded media from "The Tape Project" uses a modernized EQ curve, different from the NAB curve.
Eli D.
Post a Followup:
FAQ |
Post a Message! |
Forgot Password? |
|
||||||||||||||
|
This post is made possible by the generous support of people like you and our sponsors: