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Old 16th April 2005, 02:40 AM   #1
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Default Realistic SAF 24c - Need some help

I did not find any help doing a "search" and I'm new to vintage tube stuff.

I picked up a Realistic SAF 24c integrated amp this week. It has four-6bm8, three-12ax7 and one-6ca4 EZ81 tubes. As for as I can tell only one of the 6bm8 is bad.

On the front plate it has for each side a tre and bass control (4 total). A single Vol control that has an inside and outside knob for adjusting balance. Also on the front at the top there are 3 (up & down) "on" "off" switches for "Preamp," "Tuner," & "Aux." Also on the front left is an up & down switch for "Phono" or "T.H."

In the rear: rca inputs for "Rec," "Aux," "Tuner," "T.H.," "X-Tal," and "Mag."

Here are my questions, any help is appreciated.

For what are the RCA inputs "Rec" - "T.H." - "X-Tal" used?

Why is there an on/off switch for the Preamp? (Preamp "on" has a better richer sound)

Explain the switch for "Phono" or "T.H."

Is this amp a 12watt (RMS) each channel, hence the "24c" in the name?

I better stop :-) I'm sure I'll have other questions later.

Thanks a bunch

Sam
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Old 16th April 2005, 04:07 AM   #2
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Default Re: Realistic SAF 24c - Need some help

Quote:

For what are the RCA inputs "Rec" - "T.H." - "X-Tal" used?
T.H. is tape head.
X-tal is for a crystal phono cart.

Boy, this thing is old.
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Old 16th April 2005, 08:40 AM   #3
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Default Re: Re: Realistic SAF 24c - Need some help

Quote:
Originally posted by Bill Fitzpatrick


T.H. is tape head.
X-tal is for a crystal phono cart.

Boy, this thing is old.

Thanks, Bill.

So I guess the T.H. can be a useful preamp input also explains the front TH/Phono switch.

Another thing has me a bit puzzled. On the back is one "Speaker Phase" switch. It doesn't have any markings just click it to the left or right. Will this put both channels in or out of phase at the same time? Although I'm not sure which is which.

Sam
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Old 16th April 2005, 09:49 AM   #4
Enzo is offline Enzo  United States
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I assume you are inside it, look at the wiring to that switch to see if it affects both sides. My guts says only one, so you can put them in phase if they are not. But who knows?

REC usually meant a line out for purpose of making recordings. It was a pre volume control signal from whatever input source was selected. See if that holds for your unit. It was for tape decks. The tape input, meaning the input from a tape deck is often called PLAY or PLAYBACK in contrast.

Tape Head is a high gain input like Phono, but it has a different EQ from the RIAA curve of the Phono. Tape head expects the signal directly from the tape head, as opposed to the TAPE input which expects a line out from the deck's channel amps.

Xtal - for crystal - is the same thing as CERAMIC on some amps. The output of a crystal phono cartridge is much stronger than the magnetic cartridge we are used to. They are used in cheap record players.

If you contact Tandy, there might even be schematics available. What is there to lose?
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Old 16th April 2005, 10:34 AM   #5
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Default Re: Realistic SAF 24c - Need some help

Quote:
Originally posted by Sam Odom
Is this amp a 12watt (RMS) each channel, hence the "24c" in the name?
probably more like 8 W, but 12 is what they could have speced it at. Pictures?Tandy never built any of their own, this is likely a Japanese OEM... i know some of the Monarch 6BM8 PP came with really nice iron. What brands of tubes?.

dave
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Old 16th April 2005, 01:56 PM   #6
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Show us some pics of this amp please.
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Old 16th April 2005, 06:43 PM   #7
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Default Re: Re: Re: Realistic SAF 24c - Need some help

Quote:
Originally posted by Sam Odom
The one 6CA4 and the three 12AX7 are "Realistic Lifetime" tubes.
any little codes or "Made in X" labels -- sometimes they don't exist and if they do are often very hard to read -- those ones would likely get us a good idea of where the OEM was.

Quote:
The 6BM8 are two different matched pairs and I'm not sure of either brand. The lettering is wore. I've contacted Gintaras Sakenas of KWtubes and am getting 4 new ones (I hope).
I got some of the Russian equivalents from him... haven't tried them yet but did send a set of for cryo treatment.

dave
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Old 16th April 2005, 06:44 PM   #8
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Default Re: Re: Realistic SAF 24c - Need some help

Quote:
Originally posted by planet10


What brands of tubes?.

dave


Hello Dave,

The one 6CA4 and the three 12AX7 are "Realistic Lifetime" tubes.

The 6BM8 are two different matched pairs and I'm not sure of either brand. The lettering is wore. I've contacted Gintaras Sakenas of KWtubes and am getting 4 new ones (I hope).

I will post pictures later.


Sam
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Old 16th April 2005, 07:54 PM   #9
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Sams Photofact folder 550-12 has the SAF24 - probably earlier than yours (no "c") I don't have that one, but they're not hard to find - infotronix.us and findatube.com are online sources.
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Old 16th April 2005, 08:43 PM   #10
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The 6CA4 appears to be brand new but must be at least 30+ years old. Besides the "Realistic Lifetime" it has "Britain" in the same yellow lettering. Also has gold pins.
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