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Retro King RK 45
The RK 45 is a replica of the mid 60's JTM 45™. Unlike the reissue, this amp is hand wired point to point on a vintage style turret board and is built to the exact specs of the original. The output tranny built by Heyboer with the 6.6k primary plate load is optimal for the kt-66 power tubes. As in the originals, the filtering in the first cap is a double 32mf cap and the second is a double 16mf cap. This amp uses the early "plexi" tone control values along with the standard preamp values. You can also order this amp with the optional negative feedback control adjustable from the stock 27k to 77k (mounted on back of amp). This will give you more or less power amp gain. Eric Clapton Beano tone to AC/DC, its all here. Also available in a 2x12 combo.
Specs:
- 2 channel 4 inputs (high & low)
- High treble & normal channels
- 2 Volume, treble, mid, bass and presence
- 2 Matched KT66 power tubes (Valve Art KT66)
- 3 JJ 12AX7 pre-amp tubes
- 1 GZ34 rectifier tube
- Heyboer transformers (original radiospares specs) (120/240 volt primary)
- Output tranny has correct 6.6 k primary
- 4, 8 or 16 ohm selector
- Two speaker outputs
- Optional negative feedback control (27 to 77k)
- Plexi panels
- Original JTM 45™ Plexi specs
- Correct filtering
- Dijon "mustard" caps allen bradley carbon comp resistors
- Aluminum chassis
- Hand wired point to point (Teflon wire)
- Baltic birch cabinet (Black Levant Tolex)
- 9"h x 20"w x 8 1/4"d
Warranty: 5 year limited (1 year speakers, 90 days tubes)
Price: $1,645
2X12 Combo price: $1,895
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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
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Retro King 
