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  • Revox Toothed Counter Belt A77 B77 PR99

    Revox Toothed Counter Belt A77 B77 PR99

    Nagravox now stocks a range of belts and globes for all Revox tape machines.

    The white toothed counter belt is used on the A77, B77 and PR99 as part of the tape counter assembly. It connects the counter idler wheel (which in turn connects to the brake drum via the long black belt – sold separately) with the actual counter gear mechanism. LOOK UNDERNEATH the counter to see it!

    The toothed counter belt is an item that needs replacing at least every 5 years. It gets brittle and is commonly broken on most old machines. We offer a freshly manufactured new replacement belt. Please note these are not NOS – they are brand new fresh manufactured in Europe.   2nd hand or NOS belts are seriously a waste of time and money.

    You may ask why is such a small seemingly insignificant belt so expensive. Good question I have asked myself time and again. However in my usual fashion I am onto it and am investigating other manufacturers that could perhaps do me a short production run at a reasonable price. In the interim I offer the above.

    SUGGESTION: replace both the toothed short white belt and long black belt at the same time. The long black belt is not as expensive – please see our other listings. We also have belts for the A700 and F36, G36.

    Note: ONLY the white toothed counter belt is included in this sale.

    PLEASE NOTE: On some batch of counters (later particularly A77 ) Revox did away with the white counter belt. Check to see if your counter has one – take off the counter and look underneath. (see photo).

    $11.50

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  • Revox A77 tape recorder capacitor and preset pot upgrade kit – Mk2-4

    Revox A77 tape recorder capacitor and preset pot upgrade kit – Mk2-4

    Capacitor & Preset Pot Upgrade Kit for Revox A77 reel to reel tape recorders.
    For all models Mk2-4 & later Mk1 (except very early Mk1  – see separate kit).

    $122.00

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  • A50 / A78 amplifier capacitor & preset pot upgrade kit

    A50 / A78 amplifier capacitor & preset pot upgrade kit

    The kit contains everything you will likely need to replace and upgrade those components that due to age have deteriorated.  The kit contains specially sourced, new, freshly manufactured components from reliable manufacturers whom we have been dealing with for many years. No NOS (new old stock) or 2nd hand items!!

    This kit contains:
    •          power supply electrolytics. Newly manufactured to fit as a perfect replacement.
    •          replacements for all other electrolytic and tantalum capacitors
    •          a full set of fully enclosed cermet type preset potentiometers for power supply and main amps adjustments
    •          extra components included to cater for most main amp and preamp board variations / versions
    •          full instructions for each functional update section are included with pictures before and after detailing  which components go where and a host of useful tips, checks and basic calibration.
    Weight of kit – 420g
    Capacitors = 59.   Preset trimmers =  5.

    Tools you will need:
    •          soldering iron and solder (prefer Pb type but Pb free is OK)
    •          desoldering tool or solder sucker and/or de-soldering braid
    •          switch contact cleaner
    •          screwdrivers, nose pliers, side cutters
    •          multimeter for setting up power supply and main amps
    More about the kit
    In house we MAKE the can capacitors ourselves using low leakage  conservatively rated capacitance and working voltage electrolytic capacitors sourced from reliable OEM’s rated 63VDC. We also increase the capacitance slightly to provide improved power supply smoothing. (why – because its a prudent practice and will improve ripple, hum and noise – 6800uf for A50 and 10,000uf OPTIONAL for A78 [if you want an even higher capacitance for A78 see notes below but there is an additional cost of $22 for this option]). These large can capacitors fit directly in place exactly like the originals using your existing nuts.

    The audio signal path capacitors are specially selected low noise, low leakage / high stability types and fit in easily on the point to point wiring terminal board.

    The preset pots are cermet and fully enclosed guaranteeing decades of trouble free operation and adjustment.

    EXPENSIVE?  Why does it seem expensive compared to our tape kits?  The high capacitance electrolytics are high grade, low ESR, 105C, 63VDC rated capacitors specifically made for high grade power applications. They are aluminium can encapsulated with stud mount – exactly the same as the originals.

    OPTIONAL 10,000 uf for A78. Extra cost $30  AT CHECKOUT please request invoice before paying and specify in message / notes “require 10,000uf option”

    Don’t waste your time replacing just one or two capacitors on machines that are now 30+ years old, replace ALL the troublesome electrolytics and preset trimmers. Usually the old high capacitance capacitors associated with the power supply  will be in suspect possibly poor electrical condition even though they may appear visually OK. Some may even test OK initially on a low voltage modern tester. However capacitors usually need to be tested after they have operated for a while at working voltage and cycled through a few ON / OFF surges. For such relatively low cost components its prudent to just replace the lot. CAUTION: be careful of buying 2nd hand capacitors – it just is not worth it! Ours are new recent manufacture and specially designed as a worthy replacement for the originals.

     

     

     

    $104.00

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  • A77 capacitor & preset pot upgrade kit

    A77 capacitor & preset pot upgrade kit

     

    For all models Mk2 – Mk 4 and later Mk1 (except very early Mk1 – see separate listing kit), including:
    • STANDARD models with Transistor Speed Control PCB 1.077.725 which is later Mk1’s, Mk2 and early Mk3’s.
    • PLUS For models with IC Speed Control PCB 1.077.724 or /729 which is later A77 Mk3 and all Mk4’s.

    N.B. If you have a Mk1 we suggest the universal kit also sold here. Very early Mk1’s have slightly different PSU, tape drive and capstan boards and a separate kit is listed for them. Please check it out as it has photos of what to look for.

    This kit contains:
    • components to cover both transistor and IC speed control versions
    • replacement capacitors for all the electrolytics
    • replacement for all tantalum capacitors
    • brand new specially manufactured non polarised motor capacitors
    • all troublesome suppression capacitors on the drive control, capstan and
    • power supply.
    • a full set of fully enclosed cermet type preset potentiometers
    • small “upgrade” blank labels are provided so you can appropriately mark your upgraded boards.
    • capacitors =74, preset trimmers =18

    The kit is suitable for the following circuit boards:
    • PSU 1.077.540
    • Tape Drive 1.077.370
    • Switchboard 1.077.435/426
    • Input amp 1.077.700
    • Record 1.077.705
    • Oscillator 1.077.712
    • Record relay 1.077.715
    • Playback amp 1.077.720
    • Speed control 1.077.725 and 1.077.724 or /729
    • 3x chassis mounted motor capacitors.

    Tools you will need.
    • soldering iron and solder (prefer lead type but lead free is OK)
    • desoldering tool or a good solder sucker
    • switch contact cleaner
    • isopropyl alcohol or flux remover solvent for cleaning
    • screwdrivers, nose pliers, side cutters
    • a multimeter

    Please Note: Some pictures in gallery show a typical A77 restoration in progress in our workshop. These are for information only and are not what is supplied in our kit of parts which are shown in pictures 1 and 2.
    The kit contains specially sourced, new, freshly manufactured components from reliable manufacturers whom we have been dealing with for many years. No NOS(new old stock) or 2nd hand items!! The motor capacitors are specially manufactured for us for Revox tape deck motors as is the large power supply can type electrolytic. The audio signal path capacitors are specially selected low noise, low leakage / high stability types. The preset pots are cermet and fully enclosed guaranteeing decades of trouble free operation and adjustment.

    Please note – other audio path caps and transistors – our kits have what is most likely to be degraded without going over the top. We don’t supply any audio path paper, mica, poly or other caps

    PLEASE ALSO NOTE: Our precision high-grade motor capacitors are specially made to our specifications for us for Revox and Studer tape decks. There are NOT generic white washing machine / fan capacitors which have wide specification tolerances. They are also the exact Revox capacitance values not “approximately close”. Anyone who implies that a higher capacitance value is better is talking nonsense.
    Full instructions for each board are included with pictures before and after detailing exactly which components go where and a host of useful tips, checks and basic calibration.

    Don’t waste your time replacing just one or two capacitors on machines that are now 25 – 40 years old, replace ALL the troublesome electrolytics and tantalums. Usually the old high voltage capacitors associated with the motors and tape drive will be poor electrically and also visually. Some capacitors may test OK initially on a low voltage modern tester. However capacitors usually need to be tested after they have operated for a while at working voltage and cycled through a few ON / OFF surges. For such relatively low cost components its prudent to just replace the lot. CAUTION: be careful of buying 2nd hand motor capacitors – it just is not worth it! Ours are new recent manufacture and specially designed as a worthy replacement for the originals.
    We list separate kits for the optional accessory boards such as Loudspeaker amps and Dolby.

    $82.00

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