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Old 10th January 2008, 06:41 PM   #1
emersa is offline emersa  India
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Default Need help

I live in Mumbai, India and I am building a Fender Champ 5F1 clone. I need help locating some of the components needed to build this sweet little thing.

Follwing is a laundry list of the parts/components that I need to buy:

Tubes:
1 - 5Y3GT
1 - 12AX7
1 - 6V6GT

Sockets:
1 - 9 pin miniature (noval)
2 - 8-pin large (octal)

Capacitors:
1 - 16uF 450VDC
2 - 8uF 450VDC
2 - .02uF or .022uF
1 - 25uF/25VDC

Couple extra 25uF/25VDC bypass caps

Resistors:
1 - 470 ohm
2 - 1.5k ohm
1 - 10K
2 - 22K
2 - 68K
2 - 100K
1 - 220K
1 - 470K
1 - 1 megohm

Pots:
1 - 1 megohm

Switches:
2 - SPST toggle

Fuse:
1- Fuse socket.


First off, I want to know who sells these triode tubes in Mumbai. Any addresses and telephone numbers would be helpful. Then I need a turret board - who can make it for me? Or is there a place where I can get the turrets to make my own board. Else I would be stuck with a perfboard.

Second would be power and output transformers. Who makes customs? Would someone be able to provide any addresses and telephone numbers? 240VAC primary on the power transformer and a matched output transformer (forgive me if I sound noob but I am fairly new to all this.) I also have some PDF specs on what kind of transformer I am looking at.

Third, do you guys see any of the components listed above as difficult/impossible to get. If yes are there any suggested places where I can order them.

And last but not the least, I need a decent 8' speaker for my amp probably 8ohms impedence. I have been told that guitar speakers are specialised and differently voiced and I am sure that they are hard to get in these parts. Can someone recommend a decent speaker that I can get started with?

I do not wish to sound like I need to be spoonfed or something, but I do not intend to re-invent the wheel. If you guys already know where all this stuff can be found then it would be great help to me. In any case I am going on a recon mission to Lamington Road this weekend. Will have my set of updates then. But if I could have some prior info or leads, then I could get started with procuring some of the stuff on my first visit.

Any help is appreciated. Thanks for reading the long post.

Emersa
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Old 11th January 2008, 02:37 PM   #2
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Hi Emersa
You can find resistors atWelborne Labs
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Old 14th January 2008, 11:24 AM   #3
emersa is offline emersa  India
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Old 16th January 2008, 03:30 AM   #4
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So you are new to everything and you want to build a tube amp !

You MUST understand everything about what you are going to do before buying parts and that 'might' take some time.
You could post your questions on the forum AFTER you do some research on the Net and this forum ( using 'search' ).

To kick start all this you should spend a whole morning wandering down Lamington Road and window shop in the electronics parts market and check out some prices of the larger parts you need. I HIGHLY recommend you go along with someone who knows something about electronics .

I suspect if you pull out a list of a dozen resistors with one or two of each , most shops might throw you out !

So going with a friend will help as he can tell you which shops would entertain 'small' purchases .

But all this can be a whole lot of fun if you take it in the right spirit. It will add immensley to your project and would give plenty of memories to reflect about and talk about in the future !

Except for tubes and sockets , you should be able to find them in many shops. Do try the smaller ones as they wouldn't mind small quantities. But do walk around first to get a feel of the place !
I think you might feel more comfortable after that !

Many small branching lanes have the small shops where you can find all you need. Tubes are sold by only a few shops and they have some displayed in the window. Check out international prices for tubes as you might get ripped off on pricing and there is a VERY good chance you might get dud or highly used tubes. I would recommend buying over the net for tubes and sockets. I have done this with no problems.

Have fun.
Cheers.

AND REMEMBER you are going to work with HIGH VOLTAGES THAT CAN KILL YOU ! I think you should get help from someone who knows something !
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Old 16th January 2008, 05:10 PM   #5
emersa is offline emersa  India
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Quote:
Originally posted by ashok
So you are new to everything and you want to build a tube amp !

You MUST understand everything about what you are going to do before buying parts and that 'might' take some time.
You could post your questions on the forum AFTER you do some research on the Net and this forum ( using 'search' ).

To kick start all this you should spend a whole morning wandering down Lamington Road and window shop in the electronics parts market and check out some prices of the larger parts you need. I HIGHLY recommend you go along with someone who knows something about electronics .

I suspect if you pull out a list of a dozen resistors with one or two of each , most shops might throw you out !

So going with a friend will help as he can tell you which shops would entertain 'small' purchases .

But all this can be a whole lot of fun if you take it in the right spirit. It will add immensley to your project and would give plenty of memories to reflect about and talk about in the future !

Except for tubes and sockets , you should be able to find them in many shops. Do try the smaller ones as they wouldn't mind small quantities. But do walk around first to get a feel of the place !
I think you might feel more comfortable after that !

Many small branching lanes have the small shops where you can find all you need. Tubes are sold by only a few shops and they have some displayed in the window. Check out international prices for tubes as you might get ripped off on pricing and there is a VERY good chance you might get dud or highly used tubes. I would recommend buying over the net for tubes and sockets. I have done this with no problems.

Have fun.
Cheers.

AND REMEMBER you are going to work with HIGH VOLTAGES THAT CAN KILL YOU ! I think you should get help from someone who knows something !
Thank you for responding to my message. The reason that I am building a tube amplifier is that I am a blues guitarist and there cannot be blues music without tube amps. Plus I am on a budget, so I cannot go to the market and buy myself a tube amp. Besides, itís cooler to build your own (despite the high voltage caution). That way I also get to a thing or two about tube amps.

This is how I plan to proceed with my build. I first go on a recon at L Road, figure out whatís available and also try to get a ballpark estimate of how much the whole thing might cost. I have done a lot of research on the internet and have also been reading up a little on the thing that I intend to build. Is there any useful resource that you can point out? That would be of great help.

My reason for posting such a stupid query was that I wanted to have a feel of what I am venturing into. Plus I also wanted to know if there people who have done similar projects who can share their thoughts with me.

About the tubes, is there a way that I can differentiate used tubes from new ones?

As you rightly said, all this is going to be a great experience and I want to do this for the excitement.

Once again, thanks you for your help and look forward to your thoughts.

Emersa
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Old 2nd April 2008, 11:50 AM   #6
emersa is offline emersa  India
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I have all the parts needed for my Champ Clone. Is there someone from Mumbai who can help me with my build? Just basic queries, discussion and related stuff.

Any help is appreciated.

BTW...I am still having problems locating a good guitar speaker and chassis in Mumbai. For the chassis I am gonna use a wooden box for the moment.
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Old 3rd April 2008, 04:44 AM   #7
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There must be guys in Mumbai who build tube gear but I'm not sure if they will be able to spare time. However I do know that 'some' audio equipment shops sometimes do the construction job for a fee . Maybe you need to go through some 'contacts' ! If you want someone to sit with you through the construction work , you might have to search around.

Ask the Mumbai members on this forum for suggestions .

First time tube amp is hard AND dangerous unless you are a very careful person. But remember in the 60's there were only tube amps to build ! People did it successfully with less test instrument help than today .

I think your top plate 'must' be metal . You could use 3mm aluminum which is also easier to machine than a mild steel chassis. You can stick a paper on it and mark out all holes and cut outs and get a 'small' machine shop to drill/cut it out for you. That should not be a problem at all in Mumbai but you need to get someone to tell you where the small shops are.

Navin....and others ......any suggestions ?

Buy some books on building amps. Our famous BPB publishers have some low cost ( legal !) editions of foreign books on the subject. I think you must have something to 'read' first .

For the guitar speakers contact the pro-audio dealers . They seem to have those. Looking for any particular brand ?

Cheers.
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Old 3rd April 2008, 08:14 AM   #8
emersa is offline emersa  India
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First of all, thanks for you help Ashok.

Quote:
Originally posted by ashok

First time tube amp is hard AND dangerous unless you are a very careful person. But remember in the 60's there were only tube amps to build ! People did it successfully with less test instrument help than today .


I am aware that it is dangerous but I am too determined to make this amp.

Quote:
I think your top plate 'must' be metal . You could use 3mm aluminum which is also easier to machine than a mild steel chassis. You can stick a paper on it and mark out all holes and cut outs and get a 'small' machine shop to drill/cut it out for you. That should not be a problem at all in Mumbai but you need to get someone to tell you where the small shops are.
Why do you think that the top of the chassis should be metal? Any specific reason. I am looking for a decent aluminium sheet 2-3mm thick to make the chassis but just wanted to know if I can start building on a wooden box.

Quote:
Buy some books on building amps. Our famous BPB publishers have some low cost ( legal !) editions of foreign books on the subject. I think you must have something to 'read' first .
Can you suggest any titles? I am downloading a PDF on tube amp design overhaul and maintenance from the internet. Will let you know the title tonight.

Quote:
For the guitar speakers contact the pro-audio dealers . They seem to have those. Looking for any particular brand ?
Looking for Alnico Speakers 10Ē. Not too fussy about who makes them. Indian is fine.
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Old 4th April 2008, 06:30 AM   #9
navin is offline navin  India
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Quote:
Originally posted by emersa BTW...I am still having problems locating a good guitar speaker and chassis in Mumbai. For the chassis I am gonna use a wooden box for the moment. [/B]

Quote:
Originally posted by ashok
There must be guys in Mumbai who build tube gear but I'm not sure if they will be able to spare time.

I think your top plate 'must' be metal .

Navin....and others ......any suggestions ?

Buy some books on building amps. Our famous BPB publishers have some low cost ( legal !) editions of foreign books on the subject.

For the guitar speakers contact the pro-audio dealers . They seem to have those. Looking for any particular brand ?
emersa, i got your email and rather than reply privately I am posting here becuase I expect that others will also chime in and you should get some more help.

Ashok is right. Most of the people who could help you are retired. They just dont have the time.

One young man I know is Ravi Jagtiani. He has successfully serviced and repaired my Marshall amps and might be able to help with a build.

I do intend to ask himto build me an EL84 based gituar amp based on a Mashall circuit I had somewhere but forgot about that. Due tofamily commitments I have been out of audio for a while now.
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Old 4th April 2008, 08:30 AM   #10
emersa is offline emersa  India
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Navin...can you pass me Ravi Jagtiani's number or email. Would like to have a word with him.

What amp are you planning to build? Is it a JTM45.
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