Print E-mail

Retro King Plexi 18

Class AB cathode biased amp
This replica of the hard to find, 1966 Marshall™ 18 watt lead combo amplifier, but in a head version, has two channels (4 inputs) with a tremolo unit operating on channel two. You can order this amp with an optional rectifier switch that allows you to switch between the tube rectifier and a solid state diode rectifier. The 18 watt is for the player who needs vintage tone and reliability in a amp that every sound man will thank you for. If you desire an amp with great touch sensitivity, sweet even-order harmonics and outstanding dynamic range in a head, this amp is for you.

Specs:
- 2 channels 4 inputs (high & low)
- Normal channel volume & tone
- Trem channel volume, tone, speed & intensity
- 2-Matched JJ EL84 power tubes
- 3-JJ 12AX7 pre-amp tubes
- 1-NOS EZ81 rectifier tube
- Heyboer transformers (original radiospares spec) (120/240 volt primary)
- 4, 8 or 16 ohm selector
- Two speaker outputs
- Plexi panels
- Two speed trem pedal
- Allen Bradley carbon comp resistors
- Dijon "mustard" caps
- Aluminum chassis
- Handwired point to point (Teflon wire)
- Baltic birch cabinet
- Black Levant Tolex
- 9"h x 26"w x 8-1/4"d

Warranty: 5 year limited (1 year speakers, 90 days tubes)

Pricing:
Head: $1,545
1x12 Combo: $1,695
2x10 Combo: $1,750
2x12 Combo: $1,795

***************************************************************************
RETRO KING AVAILABLE MOD OPTIONS:

Mercury Magnetics Plexi Output Tranny: available, inquire

Cathode Cap Mod: add $35.00
On the plexi and metal face amps up through 1972, there was a .68 cap on the second stage cathode circuit. It gave an increase in gain and midrange. Retro King 50 watts come stock with this cap but you can order this amp with a small switch (installed on the front panel) that takes this cap in and out of the circuit.

Mercury Magnetics Transformers: available, inquire

Gain Stage Mod: add $100.00
Retro King also offers their gain mod, which works like this: the input tube has two sides, channel one uses one half of the tube, channel two uses the other half. On the gain mod, one half of the tube drives the other half of the tube using the volume two pot as the gain control and the volume one pot as the volume control. This gives you a great amount of controllable gain. When you plug into the channel one input, it bypasses the extra gain stage and works like a stock plexi preamp. Both channels work with a master volume that is installed on the front or back of the amp. The master volume is included in the gain stage mod.

Tube-diode rectifier switch: add $49.00

Negative Feedback Control: add $35.00
Also available is the optional negative feedback control. In these amps the negative feedback resistor varied from 47k to 100k depending on the year. With the control (mounted on back of amp) you can adjust this from 47k to 100k. This will give you more or less power amp gain.

Master Volume Mod: add $50.00
Pre or post Pl master volume. Retro King installs these on the rear of the amp or in the front in an unused input jack hole.

SOZO caps upgrade: add $35.00

Adjustable line out: add $50.00

Zero Loss Effects loop with bypass switch: add $150.00