Transmit 2
The Transmit 2 is the ultimate version of the Broadcast, combining features from the 24V Dual and the AP, with additional features and options.
Transistors:
The original Broadcast has featured several different germanium transistors over the years, and many others have been used in reproductions. For this version, I selected NOS General Electric 2N527s, which to me are without a doubt, the best sounding transistors I have used in this circuit. They have the warmth of the OC71s, and the top end bite of the TG5S, with increasing punch and clarity as voltage increases.
The silicon transistor is an NOS Motorola 2N4033, rumored to be used in the Broadcast AP. A bit higher gain than the germanium, with more chime and excellent breakup as gain is increased.
The first stage transistor is an NOS Micro Semi BC549C.
Voltage:
Should only be used with a 9V center negative DC power supply. It has an internal charge pump to boost the voltage internally for the selectable 18V and 27V. Select higher voltages for more headroom and output.
Tone:
The low cut control is a staple of the Broadcast, but the Transmit 2 also includes the most requested feature for the circuit: a high cut control. Especially useful at high volume for cutting down the peaks to optimum levels.
Also included are selectable ranges for the cuts, normal and maximum.
Output transformer:
I decided to use the Hammond 142A in the Transmit 2. It features the same specs as the Triad and OEP transformers used before, but to my ears they seem to hold the low end a bit better.
All other components used are premium, including Lumberg DC jack, Alpha pots, 105C electrolytics, 1/2W carbon film resistors, and SBP enclosures.
The Transmit 2 is the ultimate version of the Broadcast, combining features from the 24V Dual and the AP, with additional features and options.
Transistors:
The original Broadcast has featured several different germanium transistors over the years, and many others have been used in reproductions. For this version, I selected NOS General Electric 2N527s, which to me are without a doubt, the best sounding transistors I have used in this circuit. They have the warmth of the OC71s, and the top end bite of the TG5S, with increasing punch and clarity as voltage increases.
The silicon transistor is an NOS Motorola 2N4033, rumored to be used in the Broadcast AP. A bit higher gain than the germanium, with more chime and excellent breakup as gain is increased.
The first stage transistor is an NOS Micro Semi BC549C.
Voltage:
Should only be used with a 9V center negative DC power supply. It has an internal charge pump to boost the voltage internally for the selectable 18V and 27V. Select higher voltages for more headroom and output.
Tone:
The low cut control is a staple of the Broadcast, but the Transmit 2 also includes the most requested feature for the circuit: a high cut control. Especially useful at high volume for cutting down the peaks to optimum levels.
Also included are selectable ranges for the cuts, normal and maximum.
Output transformer:
I decided to use the Hammond 142A in the Transmit 2. It features the same specs as the Triad and OEP transformers used before, but to my ears they seem to hold the low end a bit better.
All other components used are premium, including Lumberg DC jack, Alpha pots, 105C electrolytics, 1/2W carbon film resistors, and SBP enclosures.
The Transmit 2 is the ultimate version of the Broadcast, combining features from the 24V Dual and the AP, with additional features and options.
Transistors:
The original Broadcast has featured several different germanium transistors over the years, and many others have been used in reproductions. For this version, I selected NOS General Electric 2N527s, which to me are without a doubt, the best sounding transistors I have used in this circuit. They have the warmth of the OC71s, and the top end bite of the TG5S, with increasing punch and clarity as voltage increases.
The silicon transistor is an NOS Motorola 2N4033, rumored to be used in the Broadcast AP. A bit higher gain than the germanium, with more chime and excellent breakup as gain is increased.
The first stage transistor is an NOS Micro Semi BC549C.
Voltage:
Should only be used with a 9V center negative DC power supply. It has an internal charge pump to boost the voltage internally for the selectable 18V and 27V. Select higher voltages for more headroom and output.
Tone:
The low cut control is a staple of the Broadcast, but the Transmit 2 also includes the most requested feature for the circuit: a high cut control. Especially useful at high volume for cutting down the peaks to optimum levels.
Also included are selectable ranges for the cuts, normal and maximum.
Output transformer:
I decided to use the Hammond 142A in the Transmit 2. It features the same specs as the Triad and OEP transformers used before, but to my ears they seem to hold the low end a bit better.
All other components used are premium, including Lumberg DC jack, Alpha pots, 105C electrolytics, 1/2W carbon film resistors, and SBP enclosures.