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Bloc Riff Nut

I broke my Marshall Super Bass

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After about 3hrs of rehearsal it started to distort.  Really heavy distortion. 

The amp was set to 8ohms and I was playing it through my new barefaced 210 which i thought I'd switched to 12 ohms but after further investigation it was in the 4 ohm setting. 

What have I broken and is it beyond repair. 

I'm devastated.  It was my favourite of all the amps I've ever played and I've been told(I have no idea myself) it's an original 1969.

 

I'm grateful for any insight you guys can give. 

 

Cheers, 

 

Phil. 

Edited by Bloc Riff Nut
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If it were me I'd get it to an amp tech who is good on valve amps. If it is indeed a 69, it is probably worth quite a bit and it isn't the sort of amp to be pocking about in without knowing what you are doing.

There is sticky with a list of recommended amp techs from all over the country.

As your profile doesn't say where you are based but , if it's Manchester area, Dave Lunt in Stockport is your man.

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Hello, BassBunny,

I'm actually living in Holland.

I can always check out Basgitaarforum.nl for info on decent amp techs.

I was just wondering how badly, and in which areas, I may have messed it up.

 

Cheers,

 

Phil.

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You could check out MR. LEE over on BGF, he knows his stuff.

There are a few more amp experts over there but he has a nice topic on his adventures in amp land, if he can't help you personally he probably knows other folks who can.

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Hi Phil, I don't think anyone can give you an answer to what the problem is without checking it out.

You will no doubt get a lot of "it could be's" but considering the re-issue of these amps are over £1K and I would imagine an original is easily that or more, I would want someone who knows what they are doing looking at it.

Good Luck with finding someone to sort it.

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I've opened up the amp and see that one of the capacitors had come lose croon the solder joint. I hope this is the reason for the distorted sound. 

Can anyone date this amp from the pictures?  

It looks very tidy inside

 

20180215_211503.jpg

Edited by Bloc Riff Nut

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Just a couple of questions which could help pinpoint the problem:

-When was it last serviced?

-Has it ever had the capacitors or valves replaced? Old capacitors do degrade and cause issues, especially the power capacitors.

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It looks like it has never been serviced as it still has the Bulgin mains connector, which needs replacing ASAP.

Edited by BigRedX
Auto correct

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3 hours ago, BigRedX said:

It looks like it has never been serviced as it still has the Bulgin mains connector, which needs replacing ASAP.

The Bulgin mains connector may not have the clearance distances between the terminals inside as specified for modern connectors, but that does not make it dangerous.  For a device that will not be used by children, and will be treated with respect by its owner, 'replace as soon as possible' is a bit of an over-reaction.

David

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I’ve got a Marshall Super Bass and I contacted Marshal direct about mine. They’ll tell you when it was built and by whom. They’ll tell you what potential issues could be and sort them for you (if you were in the UK).

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The only important age, is the age of those electrolytic capacitors.

12-15 years would be the norm before replacement is needed. If they are original, get them out of there ASAP. If they fail, you will potentially be in a whole world of pain and expense.

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I had the Super Bass serviced by fellow bassist and technician MrLee aka Sjors from Dutch forum Basgitaarforum.nl

He posted a blog of his repairs on the Dutch bass forum which you can see here below.

It sounds great.

Thanks Sjors.

MR. LEE

Re: op de reparatie-tafel van MR. LEE

Bericht 27 jun 2019, 21:24

Terug van weg-geweest ! :D 

Hier stond alweer een poosje een oudje .
Het betreft een Marshall ( JTM ) Super Bass 100 van forumlid Phil ( Bloc Riff Nut ).
Specifiek deze afwijkende uitvoering had ik nog nooit eerder gezien .
Hoewel de T-sectie van de voeding er wat rommelig en hobby-achtig uitziet met dat pertinax boardje , is dit toch fabrieks-origineel ! 
De versterker verkeerde in een verwaarloosde , slechte technische staat.
De originele plastic octal buisvoeten waren versleten/uitgelubberd en moesten alle vier worden vervangen ,......en daarna volgde het gangbare.
Op de laatste foto is te zien dat ik het vaste roosternegatief heb gewijzigd en regelbaar- , alsook dubbel heb uitgevoerd , zodat deeindbuizen beter uitgebalanceerd kunnen worden , ....en waardoor een storend 100Hz brom-niveau zo laag mogelijk kan worden gehouden. :wink: 

Door de makke ,...de upgrade ,...en ook de vreemde opbouw werd het al-met-al nog best een flink karweitje. :| 

Nu eerst maar effe een keuppie keuffie :jaaaaa: ( en daarna verder... )
BIJLAGEN
CAM02017 (Medium).jpg
CAM02015 (Medium).jpg
CAM02018 (Medium).jpg
Laatst gewijzigd door MR. LEE op 28 jun 2019, 12:08, 3 keer totaal gewijzigd.
"ohhh , speel je uhhh ...basgitaar ? ,...maar da's toch makkelijk ?,...d'r zitten toch maar vier snaren op ? " :facepalm:
 
dejohan

Re: op de reparatie-tafel van MR. LEE

Bericht 27 jun 2019, 21:37

Het lijkt wel speelgoed die pertinax. Nog nooit gezien.
Gebruikersavatar
MR. LEE

Re: op de reparatie-tafel van MR. LEE

Bericht 28 jun 2019, 01:39

Rectificatie op eerder bericht :

M'n scope heeft een service beurtje nodig :lol: ,....er zit ergens een los contact in.
Na controle met een voltmeter aan de amp output , werd de scope als verdachte ontmaskerd .
Na een tik op de behuizing verscheen een geloofwaardiger "plaatje" van dik 40 Volt ( Umax ) :!: , .....en dat is geheel in overeenstemming met de anodespanning , en uitg. imp. :wink: 



Deze versterker is echt een "vreemdsoortige produktie" , ...deoutput imp. selector kan op drie standen , t.w: 8 Ohm , 16 Ohm en 100 V lijn.
( die 100 Volt lijn , daar ontgaat me als eerste het nut een beetje van , dat hiermee nou een basgitaar-versterker is uitgerust ? )
De trafo's zijn van een zeer stevig formaat.
BIJLAGEN
CAM02023 (Medium).jpg
CAM02020 (Medium).jpg
CAM02021 (Medium).jpg
Laatst gewijzigd door MR. LEE op 02 jul 2019, 06:30, 3 keer totaal gewijzigd.
"ohhh , speel je uhhh ...basgitaar ? ,...maar da's toch makkelijk ?,...d'r zitten toch maar vier snaren op ? " :facepalm:
 
DominicMaertens

Re: op de reparatie-tafel van MR. LEE

Bericht 28 jun 2019, 06:30

Lekkere amp. Van welk jaar is ie?
Gebruikersavatar
MR. LEE

Re: op de reparatie-tafel van MR. LEE

Bericht 28 jun 2019, 10:43

DominicMaertens schreef: Lekkere amp. Van welk jaar is ie?
Dat is maar net hoe je er tegenaan kijkt,.....voor een verzamelaar zal 'ie i.i.g. best wel een behoorlijke waarde hebben.
Er is een tijd geweest dat een aantal type amps eigenlijk met produktie-fouten , wbt de voeding-gedeelten die Marshall fabriek hebben verlaten.
Het pertinax-bordje , waarop de elco's zijn gemonteerd , vind ik bovendien de schoonheidsprijs niet winnen als seriematige produktie-oplossing.,,,
....de octal buisvoeten + bedrading en componenten zitten wat te benauwd tegen dat bordje aan.
Het vergt allemaal extra aandacht en tijd om zoiets weer netjes en VEILIG op orde te kunnen brengen i.g.v. reparatie / revisie.
Ik vermoed dat dit een tussen-model ( in ontwikkeling ) tijdens produktie moet zijn geweest.

Het chassis is hier al van staal , ...en er is bij deze bass-versie 1 uitgestansd gat van een B9A buisvoet ,... en een uitgestansd gat van een octal buisvoet t.b.v. een oorspronkelijk bedoelde GZ34 gelijkrichter geblindeerd. ( Deze blinderingen zijn overigens origineel ! )

Deze Marshall is een zgn JTM "plexi" en zal vermoedelijk dateren uit 1967 .
Laatst gewijzigd door MR. LEE op 28 jun 2019, 12:12, 1 keer totaal gewijzigd.
"ohhh , speel je uhhh ...basgitaar ? ,...maar da's toch makkelijk ?,...d'r zitten toch maar vier snaren op ? " :facepalm:
Gebruikersavatar
MR. LEE

Re: op de reparatie-tafel van MR. LEE

Bericht 28 jun 2019, 11:12

Ik ben blij dat ik het bij-geleverde net-snoer toch maar eventjes voor inpectie nog even controleerde :

De oude stekker en ( nieuwe ! ) "Bulgin"- plug waren waren gevaarlijk aangesloten.
( Overigens zie ik dat heel vaak ,....de meeste muzikanten hebben geen idee , hoe je een Bulgin-plug veilig kan monteren . :| )

Hieronder een foto'tje waarbij het nu weer in orde is.
BIJLAGEN
CAM02022 (Medium).jpg
"ohhh , speel je uhhh ...basgitaar ? ,...maar da's toch makkelijk ?,...d'r zitten toch maar vier snaren op ? " :facepalm:
Gebruikersavatar
MR. LEE

Re: op de reparatie-tafel van MR. LEE

Bericht 01 jul 2019, 23:25

oude JTM "plexi" weer in orde :
BIJLAGEN
CAM02028 (Medium).jpg
"ohhh , speel je uhhh ...basgitaar ? ,...maar da's toch makkelijk ?,...d'r zitten toch maar vier snaren op ? " :facepalm:

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There maybe some Dutch speaking members here, but pasting a  load of posts in a foreign language on a mainly English speaking forum isnt of much use

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7 hours ago, fleabag said:

There maybe some Dutch speaking members here, but pasting a  load of posts in a foreign language on a mainly English speaking forum isnt of much use

Excellent piece of diversity and inclusion right there. Instead, why don’t you bung it in Google translate and help?

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2 hours ago, Billy Apple said:

Excellent piece of diversity and inclusion right there. Instead, why don’t you bung it in Google translate and help?

Don't know what devices everyone is using, but if I click through to the forum on chrome on my phone, Google automatically translates it. 

http://basgitaarforum.nl/viewtopic.php?f=5&t=63250&hilit=Op+de+tafel&start=615#p1591332

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There were some Nice pictures.

I regularly copy/paste text in foreign languages if im genuinely interested. It helped me learn Dutch. Not much help if your device struggles though.  

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3 hours ago, Billy Apple said:

Excellent piece of diversity and inclusion right there. Instead, why don’t you bung it in Google translate and help?

Why didnt the poster bung it in Google translate

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11 screens worth (on my laptop) of posts from another forum in a foreign language accompanied by tiny photographs. A simple link to the forum thread in question would have been more useful IMO.

In a minute someone will be along and quote the whole post...

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  • Haha 1

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I think i sometimes forget how annoying that gibberish can be to some people. 

It's remarkable how little frustration, if any, that English content elicits on German and Dutch forums.

I'll bear it in mind regarding future posts. 

🙄

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