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Place order via e-mail to asharpfretworks@gmail.com.  Please specify the product, quantity, and the method of payment, and I’ll send you an appropriate invoice.  No phone call orders will be taken.


•  Quadstage BiasPro Q10 – Four input bias switching unit (voltmeter required).  If you own a voltmeter this is the way to go.  You can test amps with up to four power tubes without needing to disconnect the bias probes.  Two bias probes for two power tube, and four bias probes for four power tube amps.

•  Quadstage BiasPro MQ13 – Four input bias switching unit with built-in meter (no voltmeter required).  You can test amps with up to four power tubes without needing to disconnect the bias probes.  Two bias probes for two power tube, and four bias probes for four power tube amps.

•  BiasPro 8C, BiasPro 9C, and BiasPro 7591 – Interchangeable/replacement bias probes to be used with Quadstage BiasPro Q10 and MQ13.

•  BiasPro VI-8C, BiasPro VI-9C, and BiasPro VI-7591"Bias current / Plate voltage Combo probe" to be used with Quadstage BiasPro Q10 and MQ13


Please double check that the tube you'll be working with is listed in the "BiasPro Products" page under "Supported Tube Type" section.

•  Quadstage BiasPro Q10 with VI MODULE in dual configuration (one bias and one bias/plate voltage combo probes.  BiasPro 8C/VI-8C, BiasPro 9C/VI-9C, or BiasPro 7591/VI-7591): $91.95

•  Quadstage BiasPro MQ13 with VI MODULE in dual configuration  (one bias and one bias/plate voltage combo probes.  BiasPro 8C/VI-8C, BiasPro 9C/VI-9C, or BiasPro 7591/VI-7591): $129.95

Additional Probes:

•  BiasPro 8C, BiasPro 9C, or BiasPro 7591 bias probe
$25.95 each when bundled with a Quadstage BiasPro Q10 or Quadstage BiasPro MQ13
$27.95 each when purchased separately

•  BiasPro VI-8C, BiasPro VI-9C, or BiasPro VI-7591 Bias / Plate Voltage combo probe:
$49.95 each when bundled with a Quadstage BiasPro Q10 or Quadstage BiasPro MQ13
$54.95 each when purchased separately


Payments accepted:  US issued Money Order, Personal Check, and PaypalNo credit card payment will be accepted.  The personal check will take five business days to clear.  Please specify which payment method you'll be using so that I can send you an appropriate invoice.

Did you know that Paypal gets a cut when I get paid?  If you are in the USA and a payment is made by money order or a check, I'll pass on the savings and give you a free shippingFor all international customers the payment is via Papal only.

•  Shipping within the USA is usually via USPS Priority Mail (First Class if appropriate)
$5.20 to $8.95 depending on the item, quantity and the destination

•  International shipping is via USPS First Class International Mail.
The cost is approximately $15.00 to $25.00 depending on the content of the package and which country it’s going to.  It may take up to two weeks before the package arrive - please be patient.