This is a turntable magnetic pickup pre-amplifier with some added features.
The amplifier accepts standard RCA input connectors and provides standard RCA output connectors.
There is sufficient gain to provide a nominal 1/2 volt output level to drive a sound system.
Four controls are provided, Volume, Balance, Low Tone and High Tone. These controls allow adjusting the turntable to closely match the levels and sound of a systems other sources.
There is a 1/4 inch stereo phone jack monitor output on the front panel that may be used as an additional output or use to plug in a stereo headset, 250 ohms or higher, for auditioning or private listening. This feature allows using the turntable without a sound system if desired.
The output stage is a 12AU7 in a cathode follower configuration. The 12AU7 is able to supply enough current to drive a 250 ohm or higher stereo headset to a moderate listening level directly from the cathode. The output is coupled through a low impedance, low loss capacitor blocking DC from reaching the headset. The output level into a 250 ohm headset is moderate but sufficient loudness for normal listening. Listening test were conducted using ™KOSS MV1 Stereophone's.
There is no negative feedback used, the amplifier has a very open warm sound. Distortion measurements vary depending on the brand of tubes used. Since there is no distortion canceling negative feedback in any of the circuits, the amplifier will take on the character of the type or brand of tubes used. Distortion is second harmonic dominant.
Construction is point-to-point wiring typical of the style used in classic hand wired vacuum tube audio equipment. The tubes are visible through a perforated cover. The tube cover serves to shield the pre-amplifier tubes from hum and noise pickup and also to provide protection from touching the hot tubes.
Front and rear panel lettering is engraved, the front panel lettering is filled in with paint.
Wires, including shielded wires, come pre-cut to length and stripped. The bulk of the wiring is teflon insulated for long life and resistant to melting while soldering. The shielded wires and some component wires are not teflon insulated.
The kit comes with detailed instructions and plenty of pictures to illustrate and guide parts placement. The assembly instructions comes printed in a binder that allows removing pages if desired. Assembly instructions are also provided on a CD in pdf format. SAMPLE TMA 100 INSTRUCTIONS pdf file.



KIT DIFFICULTY SCALE 4

Medium power mono-block amplifier kit using a pair of 6L6GC output tubes

Easy payment with PayPal through your PayPal account. First, email your order to
This allows checking stock for availability. Then you will receive an invoice emailed back with a total including shipping. Log into your PayPal account and send payment to

Vacuum tubes are shipped flat rate USPS to anywhere in the US, see tube listing above.
Other products...
Use the product shipping code and the shipping zone map for shipping within the U.S. For shipping cost outside the U.S., contact PHILLO. All shipments must be insurable. Shipping outside the U.S. available only to areas serviced by Federal Express, UPS or USPS (United States Postal Service).

PHILLO is a small business started by a 35 year broadcast engineering veteran with over 40 years of vacuum tube experience. The goal of this business is to provide vacuum tube kits that are as close as possible to the style of kits available in the 1950's and 1960's. The name PHILLO was picked because it is a simple unique name and is registered as PHILLO LLC. To help keep prices as reasonable as possible, these kits will use mostly standard electronic parts.
Primarily intended for North America, these kits operate on 120VAC 60HZ power and come with a standard North American 3-prong plug. This is also compatible with a few other countries but operation outside of North America may require a voltage converter.