Bogner Goldfinger 90 Retube Kits

The Bogner Goldfinger 90. The kits we offer here are the most distinctive in tonal character, forged from many years of research. Every kit is configured to provide a specific sound/experience.

These amps are adjustable bias and you can use the factory test points and a Multimeter. Gold finger 90 uses the same front end with a quad of EL34’s. One test point per pair measures across shared 10Ω resistor. Factory setting was 800Mv.  Or if you want to be a lot more accurate you can use a bias probe with a Multimeter or you can use our All-in-one “Pro One” bias probe which reads the plate voltage and the plate current simultaneously.

The default power tubes for all of our Bogner Goldfinger 90 kits are the JJ E34L’s. Thru the years the JJ E34L’s with their added punch and articulation have become a favorite here at Eurotubes and with our customers. They are very tight with an extended low end over a standard EL34. However you can use the Power Tube drop down to select the JJ EL34’s, the JJ EL34II’s, the JJ KT77’s or the JJ 6CA7’s. The JJ EL34’s are known for their mid range bloom and have a slightly looser feel when compared to the E34L’s. The JJ EL34II’s are not as aggressive as the E34L, but they are a little fuller in the lows and low mids than the EL34’s. The JJ KT77’s have an extended frequency response with big/chunky lows (even deeper than the E34L’s) and chimey/present highs. The mids are very smooth for an EL34 type tube and when driven they’re extremely rich and complex. The JJ Big Bottle 6CA7’s have big lows (on par with the KT77’s), an emphasis in the lows mids, and very round/natural highs. This gives the tube a very thick and round character that’s as close to crossing a standard EL34 with a 6L6 as you can get.

The Standard Retube Kit is as close to OEM as possible. Maintaining the amps stock level of headroom and gain while providing a warm but even handed overall sound. The kit includes one matched quad of JJ E34L’s by default, one Balanced JJ ECC803S for the phase inverter V3, one JJ ECC81 for V4 one Standard JJ ECC803S for V2 and two Standard JJ ECC83S’s for V1 – V5.

The Gold Pin Retube Kit uses the JJ ECC83S Gold Pin variants to provide a smoother, creamier, and more singing overall sound. This option is less aggressive and has less “teeth” when driven hard. If you like a classic raunchy gritty overdriven tone, we recommend looking to the Standard or High Gain option. If sweet, open, and more refined is what you’re after this kit will do it. The kit includes one matched quad of JJ E34L’s by default, one Balanced JJ ECC803S Gold Pin for the phase inverter for V3, one Standard Gold Pin JJ ECC81 for V4, one Standard JJ ECC803S for V2 and two Standard JJ Gold Pin ECC83S’s for V1 – V5.

The High Gain Retube Kit uses our hand picked high gain selected JJ ECC83S’s. If you’re looking for maximum crunch and grind this is where you want to be. Sonically this setup is very similar to our Standard Retube Kit but with a little extra gain on tap. The kit includes one matched quad of JJ E34L’s by default, one Balanced High Gain JJ ECC83S for the phase inverter in V3, one Standard JJ ECC81 for V4 and three High Gain JJ ECC83S’s for V1 – V2 – V5.

The Goldfinger 90 uses the same front end as the Goldfinger 45 so you can use this diagram for reference.