T-5 Preamp

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RGK

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T-5 Preamp
« on: 19 Feb 2009, 02:23 am »
Hello to all

I am new to the forum, but have watched it for a few days.  Judging from the expertise I see displayed I am sure someone out there can
help me.   I just purchased a 2nd hand T-5 preamp and after setting it up it appears to have some problems.  It seems that sometime in the
past the unit was rewired to some extent because it is not working properly.  I had a look inside and things have been moved about.
The problems are as follows

1.  The input/tape switch does no appear to be working correctly.  If a tape is playing through tape1 it make no difference which position it is in.
2.  When playing back through tape1 the signal overrides most of the other settings on the rotary selector.
3.  When playing back through tape2 the volume control has no effect on the signal.
4.  The level coming from the special/phono position is very low and the unit volume control must be nearly
     full on to be able to hear any sound.  The stylus is a Grado Black mm playing through a SME 3002 II tonearm.

Is there any chance that someone has a drawing or a photograph of the hard wired part of this unit.  With a bit of luck in may be simple fix.

I am very impressed with this preamp, (the tube sound and build quality), and I would like to get it working properly.

Thanks in advance for reading this.

Reg
Calgary, Alberta

Tone Depth

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Re: T-5 Preamp
« Reply #1 on: 19 Feb 2009, 02:44 am »
Call Frank at AVA:  651-330-9871

RGK

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Re: T-5 Preamp
« Reply #2 on: 19 Feb 2009, 10:20 am »
It would appear that I have still not yet learned to obey the simple rule of "Look Before You Leap".
After posting my message I checked the unit again and found on the bottom of the case a
note stating that the unit was custom wired and would exhibit the faults I mentioned.

I think there are times I should give my head a shake before I even get up in the morning.

Thanks for the fast comeback.  I will call Frank and find out if the unit can be rewired to
suit my purpose.

Reg

dB Cooper

Re: T-5 Preamp
« Reply #3 on: 19 Feb 2009, 03:40 pm »
Surely he will suggest that you send the unit in. One amateur service job is enough. If you bought the unit on ebay or agon, you should contact the (_!_) you bought it from and see if they are willing to cover any of the cost of correcting their "work". If they did not disclose the problems with the unit up front, or if they adopt a "tough t!tties" attitude, I would leave negative feedback.

By the way, #1 sounds normal to me. If not, Frank will know.
#4 sounds like the unit might not even have a phono section installed. If it does, there should be four tubes.

avahifi

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Re: T-5 Preamp
« Reply #4 on: 19 Feb 2009, 04:09 pm »
Agreed, we better see this unit.  We certainly can put it back into stock condition.

Regarding low output on phono, if the unit has a phono section there will be four tubes installed and it will have a brass thumbnut phono ground terminal close to the "Special"  (phono) inputs.

Regards,

Frank Van Alstine

gjs_cds

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Re: T-5 Preamp
« Reply #5 on: 19 Feb 2009, 04:51 pm »
The part of this mystery that just befuddles me is... why would anyone screw around w/ a perfectly fine T-5?

I get the idea of tinkering for the sake of learning, but that's what kits are for!

mark funk

Re: T-5 Preamp
« Reply #6 on: 19 Feb 2009, 07:18 pm »
You should post a pic of the in side before you send it to Frank. I like to see some of the handy work that has been done. I have seen some interesting thing done, one comes to mind, I have a Halfer DH200 and some one stuffed two 25,000 mf soup cans in there  :o it does look kinda cool they are some big caps.  :smoke:

dB Cooper

Re: T-5 Preamp
« Reply #7 on: 19 Feb 2009, 11:36 pm »
Yeah, I wonder what the "problem" was that they were attempting to "fix" with their "custom wiring"?  :duh:  :nono:

rcag_ils

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Re: T-5 Preamp
« Reply #8 on: 19 Feb 2009, 11:41 pm »
Quote
After posting my message I checked the unit again and found on the bottom of the case a
note stating that the unit was custom wired and would exhibit the faults I mentioned.

I find it hard to believe that he actually left a note in there to tell you what he did, and what's wrong.

Most of the time when you purchase something used, on Ebay or Agon, you are taking a risk. When your purchase turns out to be imperfect, you can either eat it, or fix it yourself, because chances are the sellers would advertise "as is" "no return" "it worked before I packed it", "it worked last time I used it" " no guarantee" and so on.

I bought a lot of gear used, and sometimes you can tell how honest the seller is by how his ad's written, but sometimes not, and pictures don't tell the whole story. I had equipment that I bought off Ebay or Agon that I had to put in some labor to make them to work right. Of course, sometimes I got real lucky and bought something better than what I thought.

dB Cooper

Re: T-5 Preamp
« Reply #9 on: 19 Feb 2009, 11:54 pm »
Feedback can be a good guide. If somebody has low/no/poor feedback, proceed with caution. On his website, Frank offers to bench check used AVA equipment for a nominal fee. If you can get the serial number of the unit, you can determine some things like whether the seller is telling the truth about being the original owner. I hope you got a good enough deal that it is still a good value after you get done fixing the problems. Just have AVA do it; like I said, one amateur service job is enough (no offense intended).

Was the T5 available in kit form? Maybe it was a dopey kit builder...

oneinthepipe

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Re: T-5 Preamp
« Reply #10 on: 20 Feb 2009, 12:55 am »
.

RGK

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Re: T-5 Preamp
« Reply #11 on: 20 Feb 2009, 02:05 am »
Gentlemen

First off I thank each and everyone of you for your concern and quick response.  However you can all put your
concerns to rest as I have since found out that the preamp has not been tampered with in any way.  Apparently
it was ordered wired as it is.   There is a typed instruction set attached to the bottom outside of the case explaining
what both switches do and how to use them.  If anyone is at fault it is me for being at bit to hasty in assuming
something was wrong. 

I will not mention the sellers name as we have become friends and absolutely no mischief was intended on his part.

As to sending the unit to Mr. Van Alstine for a wiring change, I think not.  It has been my experience that getting
things back and forth across the border can turn into a nightmare of paper work and expense by the time Canadian
Customs has their say.  Mr. Van Alstine I will give you a call shortly.

Thank you all again.

Reg
Calgary, Alberta


rcag_ils

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Re: T-5 Preamp
« Reply #12 on: 20 Feb 2009, 02:51 am »
Quote
I have since found out that the preamp has not been tampered with in any way.  Apparently
it was ordered wired as it is.   There is a typed instruction set attached to the bottom outside of the case explaining
what both switches do and how to use them.

Well, it mystifies me that if it was ordered, and requested to be built in such a way, why didn't it ring a bell for Frank? Didn't Frank build this?

Quote
There is a typed instruction set attached to the bottom outside of the case explaining
what both switches do and how to use them.

The instruction on the sheet has be long.......

Frank, do you remember custom built something like this?

oneinthepipe

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Re: T-5 Preamp
« Reply #13 on: 20 Feb 2009, 04:42 am »
Well, it mystifies me that if it was ordered, and requested to be built in such a way, why didn't it ring a bell for Frank?

You're kidding or you must have a phenomenally amazing memory.  I am mystified.  How many units do you think have been manufactured by AVA since then?

avahifi

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Re: T-5 Preamp
« Reply #14 on: 20 Feb 2009, 12:49 pm »
It is easy to get equipment back to us in the USA for service from Canada.  Simply first register the unit with Canadian Customs so you can prove later that you already own it.  Second ship to us via insured air parcel post with a note on the package saying, "US made goods for repair and return" and it will get to us hassle and customers duty free.  Do not ship UPS or similar or you will have Customs Duty and brokerage fees to pay.

We will return the same way with a minor repair invoice, again hassle free.

I do not remember a T5 with a detailed note of wiring changes originating here.  Again, I urge you to let us look at the unit.

You have not yet made a "tube count" for us to see if it has the optional phono section installed at all.

Regards,

Frank Van Alstine

Bill

Re: T-5 Preamp
« Reply #15 on: 20 Feb 2009, 02:54 pm »
This suspect unit can be seen on www.audioasylum.com in the classifieds under tube preamps. It's near the bottom of the listings and marked as "SOLD". I guess from a personal point of view, what bothers me is that I had a T5 listed at the same time with upgrades (regulated high voltage supplies, mute board, gold contact switches) for $100 less on "Canuck Audio Mart" and it got bypassed in favour of the discussed unit here. Go figure!

Bill

dB Cooper

Re: T-5 Preamp
« Reply #16 on: 20 Feb 2009, 03:07 pm »
Here is the "note"- doesn't look like how Frank usually operates... Sound off (no pun intended), Frank!
I notice that the unit does have the phono ground thumbscrew but the serial number isn't readable.




rcag_ils

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Re: T-5 Preamp
« Reply #17 on: 20 Feb 2009, 03:14 pm »
Quote
You're kidding or you must have a phenomenally amazing memory.  I am mystified.  How many units do you think have been manufactured by AVA since then?

Quote
I do not remember a T5 with a detailed note of wiring changes originating here.  Again, I urge you to let us look at the unit.

See I told you Frank will remember what he built, scientist always remember if he deviated from his own design even after he had built thousands of the units.

avahifi

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Re: T-5 Preamp
« Reply #18 on: 20 Feb 2009, 03:49 pm »
Yes, its ours, complete with the latest production gold contact rocker switches (no longer available unfortunately).

I sent the new owner all the applicable information so he can convert it back to stock if he desires.

Case closed.

Regards,

Frank Van Alstine

oneinthepipe

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Re: T-5 Preamp
« Reply #19 on: 20 Feb 2009, 04:05 pm »
Quote
You're kidding or you must have a phenomenally amazing memory.  I am mystified.  How many units do you think have been manufactured by AVA since then?

Quote
I do not remember a T5 with a detailed note of wiring changes originating here.  Again, I urge you to let us look at the unit.

See I told you Frank will remember what he built, scientist always remember if he deviated from his own design even after he had built thousands of the units.

Yes, you are correct.  Amazing.  I can't even remember where I hid the spare keys to our house, but I am not a scientist.   :D