The CA-70 is based on a two-stage circuit invented by Western Electric in 1913. It was licensed and built by various audio manufacturers from the 1930s through the 1950s. RCA, Gates, Western Electric, and Langevin were just a few that utilized this elegant and simple single-ended design.
Each amplifier uses our own custom interchangeable transformers and NOS capacitors, resistors, and octal tubes. With the addition of a flexible pad network, our Negative Feedback tone shaping, and inter-stage volume control, it’s like Mid Century with a Modern twist.
Chassis
The PS-6 version is a fully removable module for use with our six channel PS-6 Rack Tray. Each amplifier is easily removable via two thumb screws for flexibility, expandability, and transformer substitution.
THE CONTROLS
The (INPUT) Pad section contains a phase reverse switch, and a 5 position attenuation network of Balanced H-pads.
The first four positions are various 150/250 ohm mic pads; -6db, -12db, and -19db. The final (LN) position allows line level signals to run through the amplifier providing tone-shaping capabilities while mixing. It works as both a second-stage booster for other preamps and a summing/buss amp for program and mix material. Two amplifiers can also be chained together to create the multi-stage, high gain recording path of a vintage tube console.
The NF, High, and LOW controls all interact to create a unique tone-shaping circuit.
The NF control varies the amount of Negative Feedback present in the circuit. Counter-clockwise brightens and moves the sound forward while raising harmonics and sensitivity. Turning it clockwise increases negative feedback, producing a darker tone with a smooth, dampened harmonic structure.
The HIGH switch transitions from the natural openness of the tubes to a gentle filtering of upper frequencies. The LOW switch reacts with the NF, boosting or cutting low frequency while moving the low end from front to back in the sound stage.
The OUTPUT control knob is placed between the 1st stage 6J7 and 2nd stage 6C5 tubes.
It sets the final level and offers further control of the two-stage gain structure.
CA-70 Amplifier FEATURES:
- Two-stage 6J7/6C5 vacuum tube circuit
- 42db-54db of available gain
- Flexible input pad section for mic or line level operation
- Transformer balanced. 150 Ohm or 10k input, 600 Ohm output
- Interchangeable/Optional input and output transformers
- NOS tubes, signal caps & resistors, PEC 2W carbon pots
- Up to Six CA Series Amplifiers mount into our PS6 Rack
- Up to Two Amplifiers in our PS2 Rack
- Hand Built and Tested in the USA
PS6 Modules include choice of one input and one output transformer
Prompt Delivery and Professional Packaging
Our long-standing partnership with UPS FedEx DHL and other global carriers lets us offer a range of shipping services. Our warehouse staff is extremely skilled and will package your items according to our precise and exact specifications. Your goods will undergo an extensive inspection and be safely packaged prior to being sent out. Each day, we ship to thousands of customers in many countries. The fact that we are committed to becoming the biggest online retailer in the World is clear. These warehouses are in Europe in the same way as they are in USA.
Note: Orders that include more than one item are assigned a processing period depending on the item.
Before shipping, we will inspect thoroughly the items you have ordered. Most orders are shipped within 48 hours. Expected delivery time is between 3-7 days.
Returns
Stock is dynamic. It's not entirely managed by us since we are involved with multiple entities, including the factory and the storage. The actual stock can change at any moment. It is possible that your order may be out of stock once the order has been placed.
Our policy lasts for 30 days. We cannot exchange or refund your order if it has been 30 days from the date of purchase.
For your item to be returned it must be in its original packaging, unopened and in the condition you received it. The item must be in its original packaging.
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