Tube-Tech SSA 2B Stereo Summing Amplifier

New– Closed Box
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TUBE-TECH SSA2B sumsyour mixes Wide, Punchy and Transparent, with Rock Solid Low End!

TheTUBE-TECH SSA 2B Stereo Summing Amplifier features two very low noise/lowdistortion summing amplifiers with a very wide frequency response. It providesa high end, yet cost effective solution for analog summing, and the simplelayout of the SSA 2B makes recall just as easy as when you work ITB.

The SSA 2Bsums your mix cleaner, wider and punchier than anything, you’ve heard before.It makes it possible to perform your mixing at a level previously onlyachievable from summing with the best and most expensive consoles, and the lowend response just doesn’t get any better than this, SSA2B features the tightestlow end on the planet. Every user, we have been in contact with tells us aboutreal low end improvement when using the SSA2B for summing!

For thoseof you that haven’t yet experienced the difference between even the best ITBmix and the real thing: Do yourself a favor and listen to the SSA2B.

Features and TechnicalSpecifications

The SSA 2Bconsists of a summing amplifier at the input, a 23 stepped attenuator with arange of +/- 10 dB and an output stage. The summing amplifier is a symmetricaltwo-stage amplifier, designed around two dual, low impedance, and hightransconductance triodes. The input transformer is part of the dual feedbackconfigured as a so-called zero field transformer. The attenuator is a heavygold plated 2×23 position switch.

The outputstage is designed around two dual triodes in push-pull and an outputtransformer (with a static screen). Both the summing amplifiers and the outputamplifiers are symmetrical.

Two largeVU-meters show the levels on the XLR output sockets. To avoid the distortionintroduced by the VU-meters when connected directly to the output XLR sockets,symmetrical configured OP- amps buffer the VU-meters.

SSA2B Summing principle:

All inputsare balanced by two zero field transformers (one for each channel), but how doesa zero field transformer work? In the zero field transformer configuration, thetransformer is part of the feedback circuit.
There are several benefits for this:

1. Thevoltage across the transformer is reduced substantially whereby a much smallertransformer is needed for the same specification. The reduction is of the samemagnitude as the feedback applied.

2. Thedistortion at low frequencies is reduced substantially.

3.Frequency response in both the low and high range is extended.

4. Phaseresponse in both the low and high range, is also reduced

FAQ: Summing Amp SSA2Bunused mono inputs

IMPORTANT!

If theSSA2B mono inputs are left open, the L R channel separation is less thanspecified (narrow stereo image).

It isimportant that the mono inputs are either:

• Switched to stereo
• Connected to outputs (even if not used)
• Terminated by shorting plugs

Shortening plug, XLRconnector:

• Pin 2 and 3 electrically connected. (Signal wires shortened)
• You can make it by using a male XLR connector and soldering a small piece of wire between pin 2 and 3 inside the plug.

Connecting unbalancedsources to SSA2B:

• There is no problem with connecting an unbalanced source.
• If it is a mono jack the tip on the jack shall be on pin 2 of the XLR and the sleeve to pin 3 of the XLR.
• If hum appears, connect pin 3 of the XLR to pin 1 of the XLR.