• Daily Deals
  • Sell
  • Customer Support
  • Shop now

This listing has ended. The seller has relisted this item or one like this.

Ships to:
Ships to:

Details about  Quad Tube Audio Amp Bias Probe Tester 6L6 EL34 KT88 6V6

See original listing
Quad Tube Audio Amp Bias Probe Tester 6L6 EL34 KT88 6V6
Item Sold
Item condition:
--not specified
Jun 02, 2013 14:33:21 PDT
US $46.95
$15.00 Standard Shipping | See details
See details about international shipping here.  help icon for Shipping - opens a layer
Item location:
Hong Kong, Hong Kong


eBay item number:
Seller assumes all responsibility for this listing.
Last updated on  Apr 30, 2013 05:59:49 PDT  View all revisions

Item specifics




                               Please read the description carefully before you buy.

                                      BE  A  SMART CONSUMER



    The reading shown on the bias is in current (ma) which is better than those show reading in voltage (it does not need to convert from voltage to current. )

So far, over 500 of this item have been sold and no one complains about the accuracy of it.

You should make a clever choice.


You are bidding on a Quad amp tube bias Tester with one pair (2pcs.) Normal type probe cables only.  (It is detachable). You have an option to purchase a pair Special type 8-pins probe cables( for 7591,7591a.7355 ) or 9-pins probe cables For EL84, 6BQ5,7189 .

The price $30.00 for a pair 9-pins probe cables.( EL84 ,6BQ5,7189 )

The price $30.00 for special type8-pins probe cables.( 7591 ,7591A.7455 )


After you make a purchase and make payment, please advice me, if you want the full configuration, and I will send you a separate paypal invoice for the extra probes.



 They will cover 9 pin EL84,7189,7189A,6BQ5, tube types as well as most 8 pins octal including EL34, 6L6GC, 6V6GT, 5881, 6550, KT-66,KT88,7027,7027A, KT88's.

For the future, you can use this Tester for other type tube probe cables.


you can get the reading direct from the current meter. It does not need any convert from mV to mA. It can be work with all kinds of multi meter (Digital meter or analog pointer meters) , at range of 100mA or above.


It is a safe, risk free meter, it measures the cathode current

of the power tube for bias reading (at low voltage side of the tubes ).



Steps to check the bias of your amplifier:

1.    Turn off and unplug your amplifier.  Make sure your multi meter works properly (the fuse of meter inside the meter has not burn off  )

2.    Remove the power tubes to be checked.  If the amplifier has been used recently the output tubes will be HOT.  Allow the amplifier to cool down prior to removing the tubes.


3.    Insert bias meter probes into the tube sockets of the amplifier. 


4.    Insert the power output tubes into the bias probe sockets.


5.    Turn on your power amp and let the tubes get warm (3-5 minutes) read the bias measurement. (As shown on the picture).


6.    Move the switch from “A” to “B”or “C” , “D”.    The reading should be no more than 2 or 3 milliamps difference for a good balance between the tubes.  At this time you can adjust the current level (using the amplifiers bias adjustment control) to the appropriate level.  There are many charts online that will give you the proper range of current for your tubes.  Do not exceed the maximum level on these charts or you will damage your tubes.  If you see a red glow in your tubes turn the amplifier off immediately.  One possible reason is the bias current is too high.


7.    After you have completed checking the bias on your output tubes turn your amplifier off and allow it to cool down.  Again, the tubes will be very HOT at this time.


8.    Remove the bias probe sockets and re-insert the output tubes.


9.    You are now ready to rock and roll!


This procedure should not take more than 15-20 minutes.




While you pay please make a note to confirm it which configuration (8-pins or 9-pins) probe cables do you want. ( If you do not make a note to confirm it ,i will send you a pair normal type 8-pins probes )





Questions and answers about this item

No questions or answers have been posted about this item.


Place bid

Time left:
Current bid:
(Approximately ##1##)
Import charges:
Your max bid:
Your max bid:
By clicking Confirm bid, you commit to buy this item from the seller if you are the winning bidder.
By clicking Confirm bid, you are committing to buy this item from the seller if you are the winning bidder and have read and agree to the Global Shipping Program terms and conditions - opens in a new window or tab. Import charges previously quoted are subject to change if you increase you maximum bid amount.
Resume bidding, if the page does not update immediately.
Place bid
Review and confirm your bid
Bid confirmation
FREE shipping
See item description
(Approximately ##1##)
(Enter ##1## or more)
(Enter more than ##1##)
Your max bid:
Increase max bid
Place bid
Confirm bid
Increase max bid
Change bid
, you've been outbid. Don't let it get away - bid again!
, you're the highest bidder on this item. Hope you win it!
, you're the first bidder. Hope you win!
, you're currently the high bidder, but you're close to getting outbid.
, this auction is almost over and you're currently the high bidder.
, you're the high bidder, but the reserve price hasn't been met.
Please enter your bid again.
Please enter a valid number as the bid price.
Enter an amount that is equal or greater than the minimum bid required. This can be found under the bid entry box.
Maximum bids can't be lowered once they're submitted.
This seller requires the buyer to have a PayPal account to purchase this item. Get a PayPal account here .
Your bid is greater than or equal to the Buy It Now price. We recommend you purchase this item via Buy It Now. If you still wish to bid, you may do so below.
Time left:
Current bid:
(approximately ##1##)
Your maximum bid:
(approximately ##1##)
Increase your maximum bid:
By clicking 1 Click Bid, you commit to buy this item from the seller if you're the winning bidder. Learn moreabout 1-click bid - opens in a new window or tab
(approximately ##1##)
Winning bid:
Starting bid:
Congrats! The auction has ended and you're the winner.
The auction has ended, but the reserve price was not met.
Sorry, the auction has ended and you were outbid.
Good news, you're the high bidder.
Sorry, you've been outbid.
You're the high bidder, but the reserve price is not met.
Please enter a higher amount than the current bid.
Maximum bids cannot be lowered once submitted.
Please enter a valid number.