classnas.blogg.se - Totem pole output stage

TOTEM POLE OUTPUT STAGE DRIVER
TOTEM POLE OUTPUT STAGE SERIES

All of the early solid state designs used a transformer, which was replaced with solid state circuitry when complementary devices became available. The more serious issue is the split drive requirement.

TOTEM POLE OUTPUT STAGE SERIES

The total supply voltage must be considerably higher than a conventional push - pull design since the tubes are in series for DC. The design requires a bipolar power supply (or an output capacitor). This is why you see this design (or its variations ) used in output transformer less (OTL) amplifiers. The totem pole design can be configured with cathode followers for an even lower output impedance. The main reason is the low output impedance. Now that we have identified the totem pole design as push - pull, why would you want to use it instead of the usual push pull design. This is common in switching power supplies but I have never seen it used in analog audio. It is possible to build a four phase push - pull design. If the output devices are driven by two (or more) signals of differing phase the design is push - pull. If all of the output devices (tube or transistor) are driven in phase with each other the design is single ended. There is always some confusion in unusual multiple tube designs as to whether they are single ended or push - pull designs. However it is not a single ended design, it is a push - pull design. We have shown that the totem pole design can be made from two single ended stages. Shown below is the evolution from a single ended output stage to the totem pole design. Most of the early solid state amplifiers used this configuration, some even stacked 4 stages on top of each other in an attempt to make up for the low breakdown voltage of the early transistors. Duties, taxes and fees on shipments to destinations outside of the USA are NOT included in the price.Named for the fact that single ended stages are stacked on top of each other in “totem pole” fashion. If your delivery address is in Alaska, Hawaii, Canada or other location outside of the USA, please call (480) 607-2277) or email to determine the shipping cost and to place your order.

Shipment by FEDEX Home Delivery/Insured is FREE if your delivery addresses is within the 48 continental states. SHIPPING: The shipping weight of the Unico 150 is 59 lbs. limited electronics, tubes: 30 days "Quiet, refined, powerful, dynamic, and tonally beautiful, the Unico 150 is easily among the very best and most versatile amplifiers."

Power Consumption: 550 W (at max power on 8 ohm).

Output resistance: <0.4Ω, resistive on all audio frequencies.

Line Outputs: 1 x tape, 1 x sub (volume controlled).

Inputs: 6 x line (3 x unbalanced, 2 x balanced, 1 x “bypass” unbalanced).

Output stage: Class AB thermostable, complementary Hexfet (4 pairs for channel).

TOTEM POLE OUTPUT STAGE DRIVER

Driver stage: Pure A class, double triode totem pole 6H30.

Input stage: Pure A class, double triode totem pole ECC83.

Frequency response: -1dB 12Hz & 45kHz, -3 dB 6Hz & 80 kHz.

In fact, the scale the 150 can create is among the best I've ever heard."

"The sparse drum solo on bijou was about as live a drum sound as I've ever had in any of my home systems powerful, punctuated, and precise.And the depth of field and sheer scale the 150 conjures here are notable. This dual-approach to development has led to the creation of a product that is different to anything Unison Research – or any other manufacturer – have developed before: a powerful, great-sounding amplifier with only three stages (two tube stages and one power MOSFET stage). The Unico 150 amplifier has been designed to suit both high-end audiophile and highly scientific criteria.