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Passive components

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2 From 25
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Tube Amp Doctor GmbH
Z-TR-25K-S 25k - lin Biastrimmer, stehend für Marshall Amps
25k - lin, bias trim pot for Marshall amps
25k - lin, bias trim pot for Marshall amps like used in Marshall Amps resistance 25 kOhm nominal power 0,25 W max. voltage 250 V rotating angle 250 °

€0.99 *
Remember Part Number: Z-TR-25K-S
Tube Amp Doctor GmbH
Z-TR-25K-L 25k - lin Biastrimmer, liegend für Marshall Amps
25k - lin, bias trimer, horizontal, for Marshall amps
25k - lin, bias trimer, horizontal mounting, like used in Marshall Amps resistance 25 kOhm nominal power 0,25 W max. voltage 250 V rotating angle 250 °

€0.99 *
Remember Part Number: Z-TR-25K-L
Tube Amp Doctor GmbH
V-2525BP 25uF @ 25V 10x19mm BIPOLAR Elektrolytkondensator,
25uF @ 25V 10x19mm BIPOLAR axial capacitor
25uF @ 25V 10x19mm BIPOLAR axial capacitor Especially for Cathode Bypass Caps in Fender Amps for improved overtones and sonic performance!

€1.69 *
Remember Part Number: V-2525BP
Tube Amp Doctor GmbH
V-2525 25uF @ 25V  Elektrolytkondensator, axial, 105°C,  13mm x 6.5mm
25uF @ 25V axial capacitor, 105°C, 13mm x 6.5mm
Replacement + recommended Upgrade: V-2525BP

€0.79 *
Remember Part Number: V-2525
Tube Amp Doctor GmbH
V-50303010R 2x30uF@25V+ 50uF@300V+ 10uF@350V Becherelko,  radial
2x30uF@25V+ 50uF@300V+ 10uF@350V solder or clamp mount
Multi-section twist lock capacitor, four sections - 50uF @ 300 VDC, 30uF @ 25 VDC, 30uF @ 25 VDC and 10uF @ 350 VDC. CE Manufacturing USA Made Multi Section Can Capacitor, Hammond AO-28 Preamp for B3, C3, A100, RT3, D100 Organs....

€69.95 *
Remember Part Number: V-50303010R
Tube Amp Doctor GmbH
V-3232500R 32+32uF 500V Elektrolytkondensator, radial 35x50mm
32+32uF 500V electrolytic capacitor, radial 35x50mm
TAD - Gold Cap elektrolytic capacitor 32+32uF 500V, 85°C size: 35x50mm cap can for standard clamp mounting (d= 35mm) LCR style construction with same colour marked solder terminals. Great replacement for many european amplifiers like...

€9.60 *
Remember Part Number: V-3232500R
Tube Amp Doctor GmbH
V-32500R 32uF  500V   25x60mm Schellenmontage
32uF @ 500V 25x60mm clamp mount
TAD - Gold Cap elektrolytic capacitor 32uF 500V, 85°C size: 25x60mm for standard clamp mounting (d= 25mm), RED=+ Great replacement for many european amplifiers like Marshall, Hiwatt, Orange etc. CUSTOM MADE: Same construction and size as...

€6.95 *
Remember Part Number: V-32500R
Tube Amp Doctor GmbH
V-33500 33uF @ 500V 18x39mm Elektrolytkondensator, axial,
33uF @ 500V 18x39mm axial capacitor
superior quality, handles 105°C replaces 30uF@500V Mesa Boogie #525535 and #525530

€4.36 *
Remember Part Number: V-33500
Tube Amp Doctor GmbH
V-30303010475R 3x 30uF + 10uF  475V 35x50mm Becherelko
3x 30uF + 10uF 475V 35x50mm solder or clamp mount
Electrolytic, 30/30/30/10 µF @ 475 VDC Drop-In replacement for Leslie 4 section 30uF/30uF/30uF/10uF @ 475V For use in Leslie 122, 147, many others. fits also Fender Princeton 6G2 (Tuxedo) CE Manufacturing capacitors are hand made in the...

€67.95 *
Remember Part Number: V-30303010475R
Tube Amp Doctor GmbH
V-404030R 40uF-450V+ 40uF-400V+ 30uF-350V Becherelko,  radial
40uF-450V+ 40uF-400V+ 30uF-350V solder or clamp mount
CE Manufacturing USA Made Multi Section Can Capacitor, Hammond AO-28 Preamp for B3, C3, A100, RT3, D100 Organs. Reproduced To Exact Mallory Specs Using Original Mallory Machinery. 40uF@450V, 40uF@400V, 30uF@350V. FP / Twist Lock Style....

€69.95 *
Remember Part Number: V-404030R
JJ - Electronic s.r.o.
V-40-3X20500R 40uF+3x20uF 500V  40x50mm Schellenmontage
40uF+3x20uF 500V 40x50mm clamp mount
elektrolytic capacitor 40uF+3x20uF 500V Solder lugs size: 40x50mm for standard clamp mounting (d= 40mm)

€17.90 *
Remember Part Number: V-40-3X20500R
Tube Amp Doctor GmbH
Z-RGE470R.10W 470R /10W Glasemaille Widerstand
470R / 10W Enamel Resistor
470 Ohms/10W, 5% Enamel Resistor, high quality, perfect replacement for Hiwatt Custom 100 (DR103)

€7.50 *
Remember Part Number: Z-RGE470R.10W
Tube Amp Doctor GmbH
V-470.25V 470uF @ 25V, 105°, 10x21mm  Elektrolytkondensator, axial, Low ESR
470uF @ 25V, 105°, 10x21mm Electrolytic Capacitor, axial, Low ESR
470uF @ 25V, 105°, electrolytic capacitor, axial. Low ESR. Low impedance and low ESR with high ripple current at high frequency replacement for 400MF / 25V in Musicman RD110/50

€2.50 *
Remember Part Number: V-470.25V
Tube Amp Doctor GmbH
V-47500R 47uF  @ 500V   30x50mm Schellenmontage
47uF @ 500V 30x50mm clamp mount
TAD - Gold Cap elektrolytic capacitor 47uF 500V, 85°C size: 30x50mm for standard clamp mounting (d= 30mm) Great replacement for many european amplifiers like Marshall, Hiwatt, Orange etc. MADE IN GERMANY! PICTURE SHOWS SIMILAR ITEM!

€12.20 *
Remember Part Number: V-47500R
Tube Amp Doctor GmbH
V-4X20475R 4x 20uF  475V 35x50mm Becherelko, radial
4x 20uF 475V 35x50mm solder or clamp mount
Multisection cap for Fender Princeton Reverbs and other US made amps for soldering to the chassis. USA Made Multi Section Can Capacitor. Reproduced To Exact Mallory Specs Using Original Mallory Machinery.

€59.95 *
Remember Part Number: V-4X20475R
Tube Amp Doctor GmbH
V-5050500R 50+50uF 500V Elektrolytkondensator, radial 35x75mm
50+50uF 500V electrolytic capacitor, radial 35x75mm
TAD - Gold Cap elektrolytic capacitor 50+50uF 500V, 85°C size: ca. 35x75mm cap can for standard clamp mounting (d= 35mm) LCR style construction with same colour marked solder terminals. Great replacement for many european amplifiers like...

€9.65 *
Remember Part Number: V-5050500R
TAIWAN ALPHA ELECTRONIC CO.,LTD.
Z-LP500K-PP 500k PUSH-PULL Gitarrenpotentiometer Audio/Log, langes Gewinde, Riffelachse
500K Push/Pull DPDT Audio Pot, knurled shaft, 3/4" long threaded...
PUSH-PULL Guitar-pot, Split Shaft, 500K Audio Potentiometer 500K audio taper control pot with double pole/double throw (DPDT) push pull switch. Super quality, feel and reliability. 19mm Long shaft bushing for use in Les Pauls and other...

€12.90 *
Remember Part Number: Z-LP500K-PP
CTS Corporation
CTS-D-C50K CTS 50k Reversed LOG Custom Dimple Potentiometer, glatte 6.3mm Achse, 24mm
50K Rev.Log CTS Dimple Potentiometer, solid shaft
CTS 50k Ohm true vintage Dimple Back Reversed Audio Taper (Rev.Log) 24mm Potentiometer

€6.95 *
Remember Part Number: CTS-D-C50K
Tube Amp Doctor GmbH
V-550 5uF @ 50V, 105°C,  5x13mm Elektrolytkondensator, axial
5uF @ 50V, 105°C, 5x13mm axial capacitor
TAD Gold Cap 5uF @ 50V axial, 5x13mm, Elektrolytic cap perfect replacement for the electrolytic capacitor in the Tremolo circuit of all 100W/45W and 135W/70W Silverface Fender amps like: Twin Reverb Pro Reverb Super Reverb Also used int...

€1.50 *
Remember Part Number: V-550
Tube Amp Doctor GmbH
V-80403020525R 80+40+30+20uF 525V 35x90mm Becherelko, radial
80+40+30+20uF 525V 35 x 90mm Cap Can, radial
Multisection cap for Ampeg SVT, Fender Super Champ and other US made amps for soldering to the chassis like the original: Maintains the orignal shape, extended proof voltage of 525V, 80+40+30+20uF 525V USA Made Multi Section Can...

€69.95 *
Remember Part Number: V-80403020525R
Tube Amp Doctor GmbH
V-80100 80uF @ 100V, 105°C,  10x22mm Elektrolytkondensator, axial,
80uF @ 100V, 105°C, 10x22mm axial capacitor, axial
TAD GOLD CAP 80uF @ 100V, 105°, axial, 10x22mm 80mfd @ 100 vdc, replaces Sprague TVA in many Mesa Boogie and other US made amps. full size cap, withstands real 105° operation temperature Perfect replacement for the bias section in many...

€1.98 *
Remember Part Number: V-80100
Tube Amp Doctor GmbH
V-80450 80uF @ 450V  26x52mm Elektrolytkondensator, axial,
80uF @ 450V 26x52mm axial capacitor, axial, 85°C
80mfd @ 450 vdc, replaces Sprague TVA 1716 in many Mesa Boogie and other US made amps. full size cap, withstands real 85° operation temperature

€7.45 *
Remember Part Number: V-80450
Tube Amp Doctor GmbH
V-8475 8uF @ 475V 13x25mm Elektrolytkondensator, axial, 105°C
8uF @ 475V 13x25mm electrolytic capacitor, axial, 105°C
8mfd @ 475 VDC, axial electrolytic, 105°C rated replaces/upgrades Sprague TA 1704 can be used also in the Fender Rivera series to substitute the 4uF@450V 13x25mm axial this capicitor value has been used in many vintage US made amps as...

€2.18 *
Remember Part Number: V-8475
TAIWAN ALPHA ELECTRONIC CO.,LTD.
Z-A100K A100k LOG ALPHA Potentiometer
A100k LOG ALPHA Pot
1/4" solid metal shaft, 3/8" bushing, incl. nuts&washer, solder lug terminals A100k LOG stock values: lin - B5k / b25k / B100K B250K / B1M / B2M log - A10k / A100k / A250k / A500k / A1M rev.log - C5k / C50k

€2.75 *
Remember Part Number: Z-A100K
2 From 25

Passive Components – Potentiometers, Resistors, and Capacitors

While electron tubes actively engage in tone control and processing, a large number of passive components are present in a tube amplifier. Whether it's potentiometers, resistors, or capacitors – we offer a wide selection of these passive components for amplifiers. Thanks to our extensive inventory, we can offer components from CTS, ENGL, Mesa, and many other major manufacturers.

Potentiometers and Knobs

Potentiometers influence the flow of the signal through their variable resistance, thus affecting various factors in the sound of an amp. They are also used in electric guitars and effects units.

A faulty potentiometer initially manifests itself through audible noises (unpleasant scratching or hissing) and eventually ceases to function altogether. Annoying, but thanks to our wide range of high-quality passive components, not a problem. We particularly ensure minimal deviations from the specified reference values in our products. By selecting high-quality components, unpleasant surprises and sound losses can be avoided.

Nobody likes to operate potentiometers without the right knob! We supply suitable knobs for a wide variety of potentiometers – tailored to classic designs and of the highest quality!

Passive Components: Capacitors

The capacitor is a wonderful component that, although small and inconspicuous, can have a significant impact on the sound of an amplifier. Passive components such as capacitors, including polarized capacitors known as electrolytic capacitors, can store electrical charge and thus influence the circuitry within the amp.

We offer a wide range of capacitors, including TAD Vintage Oil Caps and TAD Audio Caps, among others, all of which are of high quality.

Especially during a complete amplifier rebuild, passive components like our capacitor kits are suitable for keeping track of the necessary capacitors. With kits for Fender Blackface, Bassman, or Tweed, complete restorations are also possible.

Passive Components: Resistors

Resistance is futile? Not with us! We offer a wide range of different resistors that help generate the right operating points and levels in the amp. Passive components such as resistors are therefore integral parts of an amplifier and, if of incorrect or poor quality, can ruin the sound.

We have all imaginable types in stock: carbon composite, glass enamel, wire, metal oxide resistors, and VDR varistors, all waiting to be professionally installed!

Active Service for Passive Components – Tube Amp Doctor Provides Everything Amps Need

Since 1993, we have been the go-to for anything related to tube amplifiers. Amps and their components are our passion, and we are not deterred by complicated projects. With an inventory of over 650,000 components in stock, we always have the right passive elements on our shelves. We are passionate about high-quality components and therefore only stock branded products from reputable suppliers. For construction projects, restoration, and repairing faulty amps, we offer fair prices and expertise for our customers!

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