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LC25 Entire Bundle
Number of Product Bundles in stock: 29

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

The LC25 Entire Bundle is a kit comprised of every single part and component needed (sans opamp) to complete a LC25 equalizer. This module is fully VPR compatible.

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

This kit ships with a EA2503 output transformer. Kits with Litz wire 2503's are also available here.

While this equalizer is very unique, it is similar in filter topology to the graphic EQ's of the early 1970's. IC gyrators are employed and the circuit has an inherently Proportional Q.

Besides the physical appearance, the only difference between the LC25 and the LC40 are the frequencies.

The biggest difference between the LC25 and most other graphic equalizers are the stepped controls. Exact recall is a must in the modern day of recording and mixing. Other similar equalizers may have fine resolution from 0dB to +/-4dB, but from that point to max cut/boost things get out of hand quickly and near impossible to repeat. By going stepped, I had the opportunity to add a -15dB cut which is a fantastic bonus!

The audio path of the LC25 is extremely unique. I have chosen to use the coveted EA2622 mic input transformer as the receiver. The EA2622 is essentially setup in the same way as line mode on the VP28. The EA2622 is buffered from the remaining circuitry by a DTO5 discrete opamp. Five bands of gyrators "hang" between each of the swinging inputs of a dual LME49720 opamp. The output stage is a socketed 2520 style discrete opamp followed by a 2503 style output transformer wired 1:3.

A 2-position toggle operates a hard-wire relay bypass. This relay bypass has a shunt jumper connected to the Pin-6 DC bus so any adjacent LC25's or LC40's can be bypassed by activating the toggle on only one unit. BYP = bypass and ACT = active.

***Please note: This kit now ships with a CA2622 in place of the EA2622.

Pictorial Build Guide and Support Documents

Additional information and photos:

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This product bundle contains the following items:
LC25 Partial Parts Kit» 1 x LC25 Partial Parts Kit
   33 pieces in stock
EA2503 Output Transformer» 1 x EA2503 Output Transformer
   29 pieces in stock
CA2622 Input Transformer» 1 x CA2622 Input Transformer
   36 pieces in stock
DOA PCB Socket Set» 1 x DOA PCB Socket Set
   4069 pieces in stock
CAPI 5-37-1A Control Knob» 10 x CAPI 5-37-1A Control Knob
   676 pieces in stock

Cost of separate items: $349.99

Available Add-On Options for the LC25 Entire Bundle
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  
 gar1731 - Assembled» gar1731 - AssembledAdd-on to cost » $60.00  
This product was added to our catalog on Thursday September 29, 2016.
Classic Audio Products, Inc.
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EA2622 Input Transformer
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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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