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FC526-XFMR Entire Bundle
FC526-XFMR Entire Bundle
$334.99
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VP26-Litz Entire Bundle (Stepped)
[VP26-Litz-Stepped]
 $228.65 
Number of Product Bundles in stock: 35

Click to enlarge

Click to enlarge

To avoid massive build errors, make sure the BOM Revision you follow matches the Revision of the PCB you are building!!

The VP26-Litz Entire Bundle (Stepped) is a kit comprised of every single part and component needed (sans opamp) to complete a VP26 microphone preamplifier. The VP26 is a single stage mic preamp for the 500 series format and is fully VPR compatible. The aluminum faceplate is wet painted and the aluminum L-bracket is yellow chromated.

***Please note: This kit now ships with a CA2622 in place of the EA2622. To eliminate possible shipping mistakes, I will not be able to substitute or swap these parts. Thanks for understanding.

Following is a list of additional components that are required to complete this build:
(1) 2520 style discrete operational amplifier
PS: DOA's can be added to this kit at the bottom of this page.

This kit ships with a Litz wire 2623-1 output transformer. Kits with EA2623-1's are also available.

***Please note: The Litz 2623-1-L wire colors are different than the EA2623-1. To use the Litz 2623-1-L on this build, please follow the table on the bottom left of this datasheet.

This kit includes a Grayhill switch for stepped gain control. Kits using a Bourns potentiometer are also available for fully variable gain control.

The VP26 preamp is essentially an exact recreation of the legendary preamp circuit found in the vintage API consoles of the mid to late '70's. The 528/536 input modules have precisely this same exact circuit. The rest of the circuit is slightly different than the ever popular 312 schematic or what is found on the 312 cards themselves. You will find a few more components in the audio path like coupling capacitors on both sides of the discrete opamp. The use of series and loading resistors, along with a few decoupling capacitors is also faithfully implemented.

The love-hate relationship with the input pad is loyally carried out on this board. The simple voltage divider or U-pad resistor network follows the exact method used on the original module. This method is historically and mathematically correct, unlike many pads implemented into the 312 type circuits. Notes on the schematic give the builder a choice of attenuation levels, with the standard and original version being -20db. You can choose from a few options calculated to represent similar source and load impedances to the ones that exist in the circuit before the pad is engaged. While some of these will provide as little as half of the attenuation, the source and load impedances may be a slight compromise, changing the interaction between microphone and preamplifier. Maybe for the better, maybe for the worse. Experimentation required. Let your ears be the judge!

The mic input transformer is Ed Anderson's EA2622. This transformer mimics the inherent flaws of the vintage AP2622 that we so enjoy and works perfectly in the VP26 circuit. A Zobel network and loading resistor are required and are implemented exactly as the original.

Of course, the discrete operational amplifier is the heart of this preamp. The industry standard 2520 footprint is utilized here.

For the balancing output transformer, the VP26 is using a trifilar wound 2623-1. The circuit utilizes two of the secondary windings in series in standard API fashion. Although the 2503 is the most recognized output transformer for an API mic preamp, it should be noted that the console input modules made use of the smaller AP2623-1 for this duty, not the 2503.

The last and possibly most unique feature of the VP26, is the use of a custom, Bourns 600 ohm T-pad output attenuator. The 3-module attenuator gives the user the ability to drive the preamp harder, and simply turn down the output level. The insertion loss of the t-pad is very minimal with a near perfect transfer of power, from input to output. This is the exact same attenuator as used for the input of the popular 1176 compressor builds. The t-pad can be skipped if so desired. The PCB is clearly marked and requires only moving two of the flying leads from the output transformer.

This product bundle contains the following items:
VP26 Partial Parts Kit» 1 x VP26 Partial Parts Kit
   35 pieces in stock
  $77.99
CA2622 Input Transformer» 1 x CA2622 Input Transformer
   71 pieces in stock
  $45.00
2623-1-Litz Output Transformer» 1 x 2623-1-Litz Output Transformer
   122 pieces in stock
  $29.30
Grayhill 1x12 Fixed Stop, Shorting Rotary Switch, Round Shaft» 1 x Grayhill 1x12 Fixed Stop, Shorting Rotary Switch, Round Shaft
   800 pieces in stock
  $19.99
VP-Gainswitch Resistor Set» 1 x VP-Gainswitch Resistor Set
   4202 pieces in stock
  $1.50
Bourns 600 ohm T-Pad Attenuator» 1 x Bourns 600 ohm T-Pad Attenuator
   224 pieces in stock
  $29.15
C&K SPDT Toggle Switch» 1 x C&K SPDT Toggle Switch
   378 pieces in stock
  $2.74
Toneluck 2PDT Pushbutton Switch» 3 x Toneluck 2PDT Pushbutton Switch
   1841 pieces in stock
  $2.10
C&K Black Bullet Switch Cap» 2 x C&K Black Bullet Switch Cap
   635 pieces in stock
  $0.38
C&K White Bullet Switch Cap» 1 x C&K White Bullet Switch Cap
   291 pieces in stock
  $0.38
DOA PCB Socket Set» 1 x DOA PCB Socket Set
   4354 pieces in stock
  $3.84
CAPI 5-50-1A Control Knob» 1 x CAPI 5-50-1A Control Knob
   202 pieces in stock
  $5.60
CAPI 5-62-1B Control Knob» 1 x CAPI 5-62-1B Control Knob
   329 pieces in stock
  $6.10

Cost of separate items: $228.65

Available Add-On Options for the VP26-Litz Entire Bundle (Stepped)
Selected Discrete Op Amp:
 No DOA» No DOAAdd-on to cost » - - -  
 SL-2520 Red Dot» SL-2520 Red DotAdd-on to cost » $65.00  
 gar2520 Full Kit Bundle» gar2520 Full Kit BundleAdd-on to cost » $17.50  
 gar2520 - Assembled» gar2520 - AssembledAdd-on to cost » $60.00  
 gar1731 Full Kit Bundle» gar1731 Full Kit BundleAdd-on to cost » $17.31  
 BB2521 LME49710 Full Kit Bundle» BB2521 LME49710 Full Kit BundleAdd-on to cost » $9.58  
This product was added to our catalog on Sunday June 14, 2015.
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Classic Audio Products, Inc. is not affiliated with API. Customers and fans should not refer to Classic Audio Products, Inc. as "Classic API." API is a registered trademark of Automated Processes Incorporated. Classic Audio Products, Inc. has no affiliation with Automated Processes Incorporated.
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